epicyclicadj.n.

Brit.

/ˌɛpᵻˈsʌɪklɪk/, U.S.

/ˌɛpəˈsaɪklɪk/,

/ˌɛpəˈsɪklɪk/

Origin: Formed within English, by derivation. Etymons: epicycle n., -ic suffix.

Etymology: < epicycle n. + -ic suffix, probably after cyclic adj. Compare post-classical Latin epicyclicus (13th century in a British source). Compare earlier epicyclical adj.

A. adj.

1. Designating a celestial object which moves around a point which in turn follows a circular orbit around another body or point in space; of, relating to, or involving such an object or its motion.Frequently in accounts of Ptolemaic astronomy (see note at epicycle n. 1).

ΘΚΠ

the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > circular > epicyclic

epicyclical1618

epicyclica1805

a1805 J. Robison Syst. Mech. Philos. (1822) III. 57 The ancient philosophers supposed, that the deferent was also a..transparent material spherical shell, turning round the earth, and that this shell was of sufficient thickness to receive the epicyclic globe within its solid substance.

1878 S. Newcomb Pop. Astron. Introd. 5 The theory of the epicyclic motions of the planets.

1925 Aberdeen Press & Jrnl. 3 Nov. 3/3 He put forward his famous theory of concentric spheres, which was in turn superseded by the epicyclic theory of Ptolemy.

1978 New Scientist 14 Dec. 866/3 The planets..were observed to move in quite a different fashion..and Ptolemy had devised his epicyclic system to explain this.

2012 D. Benson Ballet Planets v. 72 The epicyclic curve has symmetry with respect to the horizontal axis.

2. Designating a gearing which operates by means of one or more outer wheels revolving around a central wheel as they turn; involving, relating to, or forming part of such a gearing. Cf. planetary adj. 4.In addition to an arrangement where the wheels are all on the same plane, an epicyclic gear set can also take the form of a bevel gear, in which a number of wheels may be inclined at an angle to the central wheel.

ΘΚΠ

society > occupation and work > equipment > machine > parts of machines > other parts > [adjective] > other specific parts

self-balancing1796

epicyclic1841

slotted1849

reversing1864

kinematic1876

self-aligning1889

knock-off1896

underslung1909

self-cancelling1933

knock-on1952

toleranced1953

select1974

1841 R. Willis Princ. Mechanism 362 These two arrangements contain the least number of wheels to which an epicyclic train can be reduced.

1880 Engineering 16 Apr. 311/2 These consist for the most part either of some tangent screw arrangement..or some arrangement of epicyclic wheels.

1884 J. H. Cotterill Appl. Mech. vii. 189 Complex examples of similar combinations occur in the epicyclic mechanisms.

1907 Autocar 19 Jan. 92/2 Its gear is epicyclic which is pleasanter to drive with than sliding gears.

1951 U.S. Patent 2,544,502 6 Rotation of the housing drum..therefore imparts a rotary drive to the epicyclic pinion.

2005 Evo June 42/3 There's no whistle from the Nautilus-type compressor..nor is there a Jaguar-esque whine from the belt-driven epicyclic gear-set.

B. n.

1. A curve described by a point on the circumference of a circle as it both revolves around its centre and moves along the circumference of another circle; = epicycloid n. Now rare.

ΘΚΠ

the world > relative properties > number > geometry > curve > [noun] > generated by or related to a point > by revolution

cycloid1661

epicycloid1696

trochoid1704

involute figure or curve1706

roulette1708

evolute1753

epicycle1756

involute1796

hypocycloid1843

hypotrochoid1843

axoid1876

epicyclic1878

astroid1886

1878 R. A. Proctor Treat. Cycloid 171 Every planetary epicyclic is looped.

1897 H. Lamb Elem. Course Infinitesimal Calculus ix. 361 Every epicyclic can be generated in two distinct ways.

1937 Math. Gaz. 21 355 The student should be..encouraged to draw for himself some of the well-known and very beautiful polar curves like the spirals and epicyclics.

2. A gearing consisting of a central wheel and one or more outer wheels, and which operates by means of the outer wheel or wheels revolving around the central wheel.

ΘΚΠ

society > occupation and work > equipment > machine > parts of machines > wheel > [adjective] > types of cogs or gears

sun-and-planet1796

spiral gearinga1877

chainless1897

planetary1904

epicyclic1906

hypoid1926

positraction1957

1906 Daily Chron. 9 June 3/5 Another kind of gear, known as the epicyclic, its principle resembling that of the differential.

1910 Westm. Gaz. 1 Feb. 4/2 Many of the old epicyclics failed solely for the reason that their designers were too niggardly with the wearing surfaces.

1947 U.S. Patent 2,417,782 13 We refer to an epicyclic which is not arranged as a reversing drive but in which both the driving and driven elements are rotating in the same direction.

2014 T. Hadland & H.-E. Lessing Bicycle Design vii. 238 Its neatness was contrasted with earlier ‘complicated and unwieldy’ epicyclics.

This entry has been updated (OED Third Edition, March 2016; most recently modified version published online March 2022).

单词	epicyclic
释义	epicyclicadj.n. Brit. /ˌɛpᵻˈsʌɪklɪk/, U.S. /ˌɛpəˈsaɪklɪk/, /ˌɛpəˈsɪklɪk/ Origin: Formed within English, by derivation. Etymons: epicycle n., -ic suffix. Etymology: < epicycle n. + -ic suffix, probably after cyclic adj. Compare post-classical Latin epicyclicus (13th century in a British source). Compare earlier epicyclical adj. A. adj. 1. Designating a celestial object which moves around a point which in turn follows a circular orbit around another body or point in space; of, relating to, or involving such an object or its motion.Frequently in accounts of Ptolemaic astronomy (see note at epicycle n. 1). ΘΚΠ the world > relative properties > number > geometry > shape or figure > [adjective] > two-dimensional > circular > epicyclic epicyclical1618 epicyclica1805 a1805 J. Robison Syst. Mech. Philos. (1822) III. 57 The ancient philosophers supposed, that the deferent was also a..transparent material spherical shell, turning round the earth, and that this shell was of sufficient thickness to receive the epicyclic globe within its solid substance. 1878 S. Newcomb Pop. Astron. Introd. 5 The theory of the epicyclic motions of the planets. 1925 Aberdeen Press & Jrnl. 3 Nov. 3/3 He put forward his famous theory of concentric spheres, which was in turn superseded by the epicyclic theory of Ptolemy. 1978 New Scientist 14 Dec. 866/3 The planets..were observed to move in quite a different fashion..and Ptolemy had devised his epicyclic system to explain this. 2012 D. Benson Ballet Planets v. 72 The epicyclic curve has symmetry with respect to the horizontal axis. 2. Designating a gearing which operates by means of one or more outer wheels revolving around a central wheel as they turn; involving, relating to, or forming part of such a gearing. Cf. planetary adj. 4.In addition to an arrangement where the wheels are all on the same plane, an epicyclic gear set can also take the form of a bevel gear, in which a number of wheels may be inclined at an angle to the central wheel. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > other parts > [adjective] > other specific parts self-balancing1796 epicyclic1841 slotted1849 reversing1864 kinematic1876 self-aligning1889 knock-off1896 underslung1909 self-cancelling1933 knock-on1952 toleranced1953 select1974 1841 R. Willis Princ. Mechanism 362 These two arrangements contain the least number of wheels to which an epicyclic train can be reduced. 1880 Engineering 16 Apr. 311/2 These consist for the most part either of some tangent screw arrangement..or some arrangement of epicyclic wheels. 1884 J. H. Cotterill Appl. Mech. vii. 189 Complex examples of similar combinations occur in the epicyclic mechanisms. 1907 Autocar 19 Jan. 92/2 Its gear is epicyclic which is pleasanter to drive with than sliding gears. 1951 U.S. Patent 2,544,502 6 Rotation of the housing drum..therefore imparts a rotary drive to the epicyclic pinion. 2005 Evo June 42/3 There's no whistle from the Nautilus-type compressor..nor is there a Jaguar-esque whine from the belt-driven epicyclic gear-set. B. n. 1. A curve described by a point on the circumference of a circle as it both revolves around its centre and moves along the circumference of another circle; = epicycloid n. Now rare. ΘΚΠ the world > relative properties > number > geometry > curve > [noun] > generated by or related to a point > by revolution cycloid1661 epicycloid1696 trochoid1704 involute figure or curve1706 roulette1708 evolute1753 epicycle1756 involute1796 hypocycloid1843 hypotrochoid1843 axoid1876 epicyclic1878 astroid1886 1878 R. A. Proctor Treat. Cycloid 171 Every planetary epicyclic is looped. 1897 H. Lamb Elem. Course Infinitesimal Calculus ix. 361 Every epicyclic can be generated in two distinct ways. 1937 Math. Gaz. 21 355 The student should be..encouraged to draw for himself some of the well-known and very beautiful polar curves like the spirals and epicyclics. 2. A gearing consisting of a central wheel and one or more outer wheels, and which operates by means of the outer wheel or wheels revolving around the central wheel. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > wheel > [adjective] > types of cogs or gears sun-and-planet1796 spiral gearinga1877 chainless1897 planetary1904 epicyclic1906 hypoid1926 positraction1957 1906 Daily Chron. 9 June 3/5 Another kind of gear, known as the epicyclic, its principle resembling that of the differential. 1910 Westm. Gaz. 1 Feb. 4/2 Many of the old epicyclics failed solely for the reason that their designers were too niggardly with the wearing surfaces. 1947 U.S. Patent 2,417,782 13 We refer to an epicyclic which is not arranged as a reversing drive but in which both the driving and driven elements are rotating in the same direction. 2014 T. Hadland & H.-E. Lessing Bicycle Design vii. 238 Its neatness was contrasted with earlier ‘complicated and unwieldy’ epicyclics. This entry has been updated (OED Third Edition, March 2016; most recently modified version published online March 2022). < adj.n.a1805
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