rostellumn.

Brit.

/rɒˈstɛləm/, U.S.

/rɔˈstɛləm/,

/rɑˈstɛləm/

Inflections: Plural rostella.

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

Etymology: < post-classical Latin rostellum (in sense 1a, Linnaeus Philosophia botanica (1751) 54; 1809 or earlier in sense 2a; 1810 or earlier in sense 2b), specific uses of classical Latin rostellum small beak or snout (Pliny) < rostrum beak (see rostrum n.) + -ellum -ellum suffix. In sense 1b after French rostellum (L. C. Richard 1818, in Mém. du Muséum d'Hist. Nat. 4 32).

1. Botany.

†a. The radicle of a seed. Cf. rostel n. Obsolete.

ΘΚΠ

the world > plants > part of plant > reproductive part(s) > seed > [noun] > parts of > embryo or radicle

embryon1640

germen1651

neb1658

radicle1671

embryo1682

embryo plant1692

plantula1698

plantleta1711

germ1721

niba1722

radicula1725

plantule1727

radicule1728

rostellum1760

radicale1763

rostel1783

heartlet1808

corcle1810

proembryo1849

tigelle1860

hypophysis1875

embryoid1963

1760 J. Lee Introd. Bot. i. vii. 15 These Seeds..consist only of the Plumula of a naked Corculum, where the Rostellum is inserted into the Calyx of the Plant.

1797 Encycl. Brit. III. 435/2 The Corculum..consists of two parts, viz. plumula and rostellum.

1826 L. E. Lathrop Farmer's Libr. (ed. 2) xvii. 111 The worm leaves the rostellum, or sprout, untouched.

1832 J. Lindley Introd. Bot. (1839) 250 The radicle..(rhizoma or rostellum); cotyledons..; and plumule.

1890 H. E. F. Garnsey & I. B. Balfour tr. J. von Sachs Hist. Bot. i. ii. 96 The embryo is called [by Linnaeus] the ‘corculum’, and two parts are distinguished in it, the ‘plumula’ and the ‘rostellum’ (radicle).

b. In certain plants, esp. orchids: a beak-like projection at the base of the stigma which serves to separate the stigma and anther and to prevent self-pollination of the plant.

ΘΚΠ

the world > plants > particular plants > cultivated or valued plants > particular cultivated or ornamental plants > particular flower or plant esteemed for flower > [noun] > orchids > parts of

cullions1611

thyrsus1704

labellum1810

retinaculum1821

rostellum1821

caudicle1830

pseudobulb1832

massula1856

antenna1862

clinandrium1864

bucket1871

slipper1902

1821 S. F. Gray Nat. Arrangem. Brit. Plants I. 207 Herminium... Musk-orchis... Retinacle naked, rather large, with a striking snail-like hollow underneath, joined to a short blunt rostellum.

1862 C. Darwin On Var. Contrivances Orchids Fertilised Introd. 6 The rostellum either includes or is formed of viscid matter.

1885 H. O. Forbes Naturalist's Wanderings Eastern Archipel. ii. 93 The rostellum..retains the more natural orchideal form of a broad flat floor to the anther.

1960 Brittonia 12 222 The anther is terminal or..somewhat dorsal, and is separated from the stigma by a short partition-like rostellum.

2006 A. A. Chadwick & A. E. Chadwick Classic Cattleyas 46 A tiny flap called a rostellum separates the male pollen sacs from the female stigmatic surface.

2. Zoology.

a. A projecting part likened to a beak; esp. the piercing mouthparts of a sucking insect, as a louse or bug. Now rare.

ΚΠ

1814 Edinb. Encycl. (1830) VII. 421/2 Apex of the mandibulæ [in certain spiders of the genus Mygale] furnished with a rostellum.

1824 Jrnl. Acad. Nat. Sci. Philadelphia 4 i. 327 R. raptatorius... Rostellum slightly arcuated, pale.

1872 Proc. Royal Soc. 20 495 This genus [of echinid],..with the anal opening at the bottom of a deep posterior groove excavated in a kind of projecting rostellum,..must be referred to the Cassidulidæ.

1909 Proc. Royal Soc. B. 81 28 Slender forms shaped like ordinary trypanosomes, with a beak or rostellum at one end.

b. The protruding forepart of the head of a tapeworm, typically armed with hooklets or spines.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Cestodes > member of > segmented > hooked part of head

rostellum1837

1837 R. Owen in Todd's Cycl. Anat. & Physiol. II. 131/1 If that were the case, where would be the necessity for an armed rostellum in addition to the absorbent pores?

1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 225 Taenia elliptica..also possesses a peculiar round rostellum beset with four irregular rows of sixty small hooks.

1914 Science 20 Mar. 435/2 A well-defined series of rostella, developing in complexity, can be established, beginning with this very simple type found in the turtle cestode.

2004 Jrnl. Parasitol. 90 914/2 T. solium has a prominent scolex and rostellum, with a protruded double row of hooks.

This entry has been updated (OED Third Edition, November 2010; most recently modified version published online June 2022).

单词	rostellum
释义	rostellumn. Brit. /rɒˈstɛləm/, U.S. /rɔˈstɛləm/, /rɑˈstɛləm/ Inflections: Plural rostella. Origin: A borrowing from Latin. Etymon: Latin rostellum. Etymology: < post-classical Latin rostellum (in sense 1a, Linnaeus Philosophia botanica (1751) 54; 1809 or earlier in sense 2a; 1810 or earlier in sense 2b), specific uses of classical Latin rostellum small beak or snout (Pliny) < rostrum beak (see rostrum n.) + -ellum -ellum suffix. In sense 1b after French rostellum (L. C. Richard 1818, in Mém. du Muséum d'Hist. Nat. 4 32). 1. Botany. †a. The radicle of a seed. Cf. rostel n. Obsolete. ΘΚΠ the world > plants > part of plant > reproductive part(s) > seed > [noun] > parts of > embryo or radicle embryon1640 germen1651 neb1658 radicle1671 embryo1682 embryo plant1692 plantula1698 plantleta1711 germ1721 niba1722 radicula1725 plantule1727 radicule1728 rostellum1760 radicale1763 rostel1783 heartlet1808 corcle1810 proembryo1849 tigelle1860 hypophysis1875 embryoid1963 1760 J. Lee Introd. Bot. i. vii. 15 These Seeds..consist only of the Plumula of a naked Corculum, where the Rostellum is inserted into the Calyx of the Plant. 1797 Encycl. Brit. III. 435/2 The Corculum..consists of two parts, viz. plumula and rostellum. 1826 L. E. Lathrop Farmer's Libr. (ed. 2) xvii. 111 The worm leaves the rostellum, or sprout, untouched. 1832 J. Lindley Introd. Bot. (1839) 250 The radicle..(rhizoma or rostellum); cotyledons..; and plumule. 1890 H. E. F. Garnsey & I. B. Balfour tr. J. von Sachs Hist. Bot. i. ii. 96 The embryo is called [by Linnaeus] the ‘corculum’, and two parts are distinguished in it, the ‘plumula’ and the ‘rostellum’ (radicle). b. In certain plants, esp. orchids: a beak-like projection at the base of the stigma which serves to separate the stigma and anther and to prevent self-pollination of the plant. ΘΚΠ the world > plants > particular plants > cultivated or valued plants > particular cultivated or ornamental plants > particular flower or plant esteemed for flower > [noun] > orchids > parts of cullions1611 thyrsus1704 labellum1810 retinaculum1821 rostellum1821 caudicle1830 pseudobulb1832 massula1856 antenna1862 clinandrium1864 bucket1871 slipper1902 1821 S. F. Gray Nat. Arrangem. Brit. Plants I. 207 Herminium... Musk-orchis... Retinacle naked, rather large, with a striking snail-like hollow underneath, joined to a short blunt rostellum. 1862 C. Darwin On Var. Contrivances Orchids Fertilised Introd. 6 The rostellum either includes or is formed of viscid matter. 1885 H. O. Forbes Naturalist's Wanderings Eastern Archipel. ii. 93 The rostellum..retains the more natural orchideal form of a broad flat floor to the anther. 1960 Brittonia 12 222 The anther is terminal or..somewhat dorsal, and is separated from the stigma by a short partition-like rostellum. 2006 A. A. Chadwick & A. E. Chadwick Classic Cattleyas 46 A tiny flap called a rostellum separates the male pollen sacs from the female stigmatic surface. 2. Zoology. a. A projecting part likened to a beak; esp. the piercing mouthparts of a sucking insect, as a louse or bug. Now rare. ΚΠ 1814 Edinb. Encycl. (1830) VII. 421/2 Apex of the mandibulæ [in certain spiders of the genus Mygale] furnished with a rostellum. 1824 Jrnl. Acad. Nat. Sci. Philadelphia 4 i. 327 R. raptatorius... Rostellum slightly arcuated, pale. 1872 Proc. Royal Soc. 20 495 This genus [of echinid],..with the anal opening at the bottom of a deep posterior groove excavated in a kind of projecting rostellum,..must be referred to the Cassidulidæ. 1909 Proc. Royal Soc. B. 81 28 Slender forms shaped like ordinary trypanosomes, with a beak or rostellum at one end. b. The protruding forepart of the head of a tapeworm, typically armed with hooklets or spines. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Platyhelminthes > [noun] > class Cestodes > member of > segmented > hooked part of head rostellum1837 1837 R. Owen in Todd's Cycl. Anat. & Physiol. II. 131/1 If that were the case, where would be the necessity for an armed rostellum in addition to the absorbent pores? 1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 225 Taenia elliptica..also possesses a peculiar round rostellum beset with four irregular rows of sixty small hooks. 1914 Science 20 Mar. 435/2 A well-defined series of rostella, developing in complexity, can be established, beginning with this very simple type found in the turtle cestode. 2004 Jrnl. Parasitol. 90 914/2 T. solium has a prominent scolex and rostellum, with a protruded double row of hooks. This entry has been updated (OED Third Edition, November 2010; most recently modified version published online June 2022). < n.1760
随便看	thirdgeneration thirdgrader thirdhand dealer thirding thirdings thirdlevel thirdlier thirdliest thirdling thirdly thirdman argument thirdness thirdpointed thirdrate thirdrateling thirdrater thirds thirds card thirds-and-fourths thirdsandfourths thirdsman thirdsmen thirdsome thirdstage thirdtermery