plexusn.

Brit.

/ˈplɛksəs/, U.S.

/ˈplɛksəs/

Inflections: Plural plexuses, (rare) unchanged.

Origin: A borrowing from Latin. Etymon: Latin plexus.

Etymology: < post-classical Latin plexus, denoting an interwoven structure in the body (1543 or earlier) < classical Latin plectere to plait, twine, interweave ( < the same Indo-European base as Old High German flehtan (see flax n.), representing a -t- extension of the Indo-European base of ancient Greek πλέκειν to plait: see fold v.¹) + -tus, suffix forming verbal nouns. Compare French plexus (1575 in Middle French in Paré).Latin plexus is recorded in classical Latin in sense ‘plaiting, braid’ only as a variant reading, now generally discounted, but compare -plexus in e.g. amplexus (see amplexus n.), complexus (see complex n.).

1. Anatomy and Zoology. A network of fibres, vessels, etc.; spec. a structure consisting of interconnecting branches of nerves or blood vessels. Frequently with distinguishing word.choroid, Meissner's, solar plexus: see the first element. See also myenteric adj., pampiniform adj.

ΘΚΠ

the world > life > the body > bodily substance > fibre > [noun] > network of

texture1578

plexus1666

plexure1672

weaving1739

chiasma1839

incruciation1855

1666 S. Parker Acct. Divine Dominion & Goodness 67 The chief defect he could discover in him was, that this Plexus of the Intercostal Nerve..was exceeding small.

1714 J. Purcell Treat. Cholick 13 If these Animal Spirits or Recrements can continue their Motion down the minute Channels of the little Nerves, into these Plexus's, Why should they stop there?

1728 E. Chambers Cycl. (at cited word) Several Branches both from the Hepatic and Splenic Plexus..form the Mesenteric Plexus.

1796 S. Walker Treat. Nerv. Dis. i. 41 Some junction of nervous filaments, forming a plexus, might be supposed sufficient to account for these phenomena.

1836 Philos. Trans. (Royal Soc.) 126 546 Some of the branches interweave with each other, and form a small plexus..before they are distributed to their proper muscles.

1872 T. H. Huxley Lessons Elem. Physiol. (ed. 6) xi. 271 Great net-works, or plexuses.

1882 Amer. Jrnl. Med. Sci. 84 589 Dr. Meyer discovered a painful pressure-point at the upper part of the brachial plexus.

1955 R. Macintosh & M. Ostlere Local Analgesia Head & Neck iii. 29 The glossopharyngeal and vagus nerves are intimately interwoven in the pharyngeal plexus.

1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) xviii. 291 The solar plexus in the region of the stomach and the urinogenital plexus farther back are each formed by an anastomosis of branching nerves of the sympathetic system in union with several ganglionic masses of nerve cells.

1994 B. Hambly Crossroad vi. 71 Mr. Spock reached out and pressurized the brachial nerve plexus.

2. gen. Any intertwined or interwoven mass; an intricate arrangement or collection of things; a network.

ΘΚΠ

the world > space > relative position > intertwining or interweaving > [noun] > that which is intertwined

intertexture1651

plexure1661

twistinga1673

interweftage1673

braid1708

plexus1769

interlacery1865

interweft1927

1769 E. Bancroft Ess. Nat. Hist. Guiana 33 Their footstalks are inclosed in a strong reticular web-like plexus, which is the cloathing this tree has been said to afford.

1863 H. Spencer Ess. 2nd Ser. 24 Relations each of which has for its terms a complete plexus of antecedents and a complete plexus of consequents.

1891 J. W. Powell in Scribner's Mag. Oct. 465 The partial channels sometimes interlock so as to form a plexus over the area of the delta.

1957 G. E. Hutchinson Treat. Limnol. I. ii. 173 An extraordinary plexus of lacustrine channels between drumlins.

1994 Sci. Amer. Sept. 75/1 Although software seems like malleable stuff, most programs are actually intricate plexuses of brittle logic through which data of only the right kind may pass.

3. Mathematics. A system of mathematical relations. Now rare.

ΘΚΠ

the world > relative properties > number > algebra > [noun] > expression > equation > system of

plexus1860

1860 A. Cayley Coll. Math. Papers IV. 603 Such a system of equations, or generally the system of equations required for the complete expression of the relations existing between a set of quantities (and which are in general more numerous than the relations themselves) is said to be a Plexus.

1864 J. J. Sylvester in Philos. Trans. (Royal Soc.) 154 627 The three quantities equated to zero are not separately invariants, but constitute in their ensemble an invariantive plexus.

1922 Trans. Amer. Math. Soc. 24 242 The plexus of congruences rotates about this plane through an infinitesimal amount given by the intensity of the 2-vector.

1986 SIAM Jrnl. Appl. Math. 46 199 Mathematically, an oscillator is a system of ordinary differential equations with a periodic limit cycle, usually arising from a Hopf bifurcation for a stationary solution. A plexus is a collection of such oscillators, coupled to each other via one-way or two-way communication channels.

This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	plexus
释义	plexusn. Brit. /ˈplɛksəs/, U.S. /ˈplɛksəs/ Inflections: Plural plexuses, (rare) unchanged. Origin: A borrowing from Latin. Etymon: Latin plexus. Etymology: < post-classical Latin plexus, denoting an interwoven structure in the body (1543 or earlier) < classical Latin plectere to plait, twine, interweave ( < the same Indo-European base as Old High German flehtan (see flax n.), representing a -t- extension of the Indo-European base of ancient Greek πλέκειν to plait: see fold v.¹) + -tus, suffix forming verbal nouns. Compare French plexus (1575 in Middle French in Paré).Latin plexus is recorded in classical Latin in sense ‘plaiting, braid’ only as a variant reading, now generally discounted, but compare -plexus in e.g. amplexus (see amplexus n.), complexus (see complex n.). 1. Anatomy and Zoology. A network of fibres, vessels, etc.; spec. a structure consisting of interconnecting branches of nerves or blood vessels. Frequently with distinguishing word.choroid, Meissner's, solar plexus: see the first element. See also myenteric adj., pampiniform adj. ΘΚΠ the world > life > the body > bodily substance > fibre > [noun] > network of texture1578 plexus1666 plexure1672 weaving1739 chiasma1839 incruciation1855 1666 S. Parker Acct. Divine Dominion & Goodness 67 The chief defect he could discover in him was, that this Plexus of the Intercostal Nerve..was exceeding small. 1714 J. Purcell Treat. Cholick 13 If these Animal Spirits or Recrements can continue their Motion down the minute Channels of the little Nerves, into these Plexus's, Why should they stop there? 1728 E. Chambers Cycl. (at cited word) Several Branches both from the Hepatic and Splenic Plexus..form the Mesenteric Plexus. 1796 S. Walker Treat. Nerv. Dis. i. 41 Some junction of nervous filaments, forming a plexus, might be supposed sufficient to account for these phenomena. 1836 Philos. Trans. (Royal Soc.) 126 546 Some of the branches interweave with each other, and form a small plexus..before they are distributed to their proper muscles. 1872 T. H. Huxley Lessons Elem. Physiol. (ed. 6) xi. 271 Great net-works, or plexuses. 1882 Amer. Jrnl. Med. Sci. 84 589 Dr. Meyer discovered a painful pressure-point at the upper part of the brachial plexus. 1955 R. Macintosh & M. Ostlere Local Analgesia Head & Neck iii. 29 The glossopharyngeal and vagus nerves are intimately interwoven in the pharyngeal plexus. 1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) xviii. 291 The solar plexus in the region of the stomach and the urinogenital plexus farther back are each formed by an anastomosis of branching nerves of the sympathetic system in union with several ganglionic masses of nerve cells. 1994 B. Hambly Crossroad vi. 71 Mr. Spock reached out and pressurized the brachial nerve plexus. 2. gen. Any intertwined or interwoven mass; an intricate arrangement or collection of things; a network. ΘΚΠ the world > space > relative position > intertwining or interweaving > [noun] > that which is intertwined intertexture1651 plexure1661 twistinga1673 interweftage1673 braid1708 plexus1769 interlacery1865 interweft1927 1769 E. Bancroft Ess. Nat. Hist. Guiana 33 Their footstalks are inclosed in a strong reticular web-like plexus, which is the cloathing this tree has been said to afford. 1863 H. Spencer Ess. 2nd Ser. 24 Relations each of which has for its terms a complete plexus of antecedents and a complete plexus of consequents. 1891 J. W. Powell in Scribner's Mag. Oct. 465 The partial channels sometimes interlock so as to form a plexus over the area of the delta. 1957 G. E. Hutchinson Treat. Limnol. I. ii. 173 An extraordinary plexus of lacustrine channels between drumlins. 1994 Sci. Amer. Sept. 75/1 Although software seems like malleable stuff, most programs are actually intricate plexuses of brittle logic through which data of only the right kind may pass. 3. Mathematics. A system of mathematical relations. Now rare. ΘΚΠ the world > relative properties > number > algebra > [noun] > expression > equation > system of plexus1860 1860 A. Cayley Coll. Math. Papers IV. 603 Such a system of equations, or generally the system of equations required for the complete expression of the relations existing between a set of quantities (and which are in general more numerous than the relations themselves) is said to be a Plexus. 1864 J. J. Sylvester in Philos. Trans. (Royal Soc.) 154 627 The three quantities equated to zero are not separately invariants, but constitute in their ensemble an invariantive plexus. 1922 Trans. Amer. Math. Soc. 24 242 The plexus of congruences rotates about this plane through an infinitesimal amount given by the intensity of the 2-vector. 1986 SIAM Jrnl. Appl. Math. 46 199 Mathematically, an oscillator is a system of ordinary differential equations with a periodic limit cycle, usually arising from a Hopf bifurcation for a stationary solution. A plexus is a collection of such oscillators, coupled to each other via one-way or two-way communication channels. This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1666
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