astroidadj.n.

Brit.

/ˈastrɔɪd/, U.S.

/ˈæstrɔɪd/

Origin: A borrowing from Greek. Etymon: Greek ἀστροειδής.

Etymology: < Hellenistic Greek ἀστροειδής starlike < ancient Greek ἀστήρ star (see aster n.) + -οειδής -oid suffix.In quot. 1829 at sense A. 1 after post-classical Latin astroidea (1803). With the later specific use in sense A. 1, compare scientific Latin Asteroidea (see asteroid adj. 2).

A. adj.

1. Zoology and Botany. Star-shaped, starlike; (in later use) spec. = asteroid adj. 2. Now rare.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [adjective] > of, belonging to, or characteristic of Asteroidea

astroid1829

asteroid1888

1829 J. C. Loudon Encycl. Plants 976 (table) Arthonia... Astroidea Ach. astroid. membranous.

1849 Proc. 1st Meeting Amer. Assoc. Advancem. Sci. 69 I would resume my observations upon this Astroid Polyp.

1873 Grevillea July 140 Arthonia astroidestera...Having the apothecia more distinctly astroid.

1962 Jrnl. Paleontol. 36 516/2 Orionastrea hudsoni may have arisen by evolution of ceroid-astroid and ceroid-aphroid forms from Thysanophyllum princeps.

2. Geometry. Designating an astroid; of or relating to an astroid.

ΚΠ

1935 U.S. Patent 2,013,746 2/2 A chaplet having a shank whose section is substantially one bounded by an astroid curve.

1977 Math. in School 6 8/2 There are..other ways of generating the Astroid curve.

1987 Nature 21 May 194/1 The angular size of a cone of astroid cross-section.

2006 P. P. Freitas et al. in D. Sellmyer & R. Skomski Adv. Magn. Nanostructures xiv. 422 The Stoner-Wohlfarth coherent-rotation model..yields an astroid switching curve.

B. n.

Geometry. A hypocycloid with four cusps.The curve can be pictured as a square with each of its sides made concave.

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

1886 G. S. Carr Synopsis Elem. Results Math. II. Index 850/2 Astroid of a conic.

1921 Amer. Math. Monthly 28 94 The four-leaved clover is the pedal curve of the so-called four-cusped hypocycloid or astroid.

1991 D. Wells Penguin Dict. Curious & Interesting Geom. 10 Astroid or hypocycloid of four cusps..is the locus of a point on a circle rolling inside another circle four times its diameter.

2009 C. L. Diefenderfer & R. B. Nelsen Calculus Coll. 170 We can generate an abundance of rational points on astroids.

This entry has been updated (OED Third Edition, March 2012; most recently modified version published online December 2021).

单词	astroid
释义	astroidadj.n. Brit. /ˈastrɔɪd/, U.S. /ˈæstrɔɪd/ Origin: A borrowing from Greek. Etymon: Greek ἀστροειδής. Etymology: < Hellenistic Greek ἀστροειδής starlike < ancient Greek ἀστήρ star (see aster n.) + -οειδής -oid suffix.In quot. 1829 at sense A. 1 after post-classical Latin astroidea (1803). With the later specific use in sense A. 1, compare scientific Latin Asteroidea (see asteroid adj. 2). A. adj. 1. Zoology and Botany. Star-shaped, starlike; (in later use) spec. = asteroid adj. 2. Now rare. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [adjective] > of, belonging to, or characteristic of Asteroidea astroid1829 asteroid1888 1829 J. C. Loudon Encycl. Plants 976 (table) Arthonia... Astroidea Ach. astroid. membranous. 1849 Proc. 1st Meeting Amer. Assoc. Advancem. Sci. 69 I would resume my observations upon this Astroid Polyp. 1873 Grevillea July 140 Arthonia astroidestera...Having the apothecia more distinctly astroid. 1962 Jrnl. Paleontol. 36 516/2 Orionastrea hudsoni may have arisen by evolution of ceroid-astroid and ceroid-aphroid forms from Thysanophyllum princeps. 2. Geometry. Designating an astroid; of or relating to an astroid. ΚΠ 1935 U.S. Patent 2,013,746 2/2 A chaplet having a shank whose section is substantially one bounded by an astroid curve. 1977 Math. in School 6 8/2 There are..other ways of generating the Astroid curve. 1987 Nature 21 May 194/1 The angular size of a cone of astroid cross-section. 2006 P. P. Freitas et al. in D. Sellmyer & R. Skomski Adv. Magn. Nanostructures xiv. 422 The Stoner-Wohlfarth coherent-rotation model..yields an astroid switching curve. B. n. Geometry. A hypocycloid with four cusps.The curve can be pictured as a square with each of its sides made concave. 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 1886 G. S. Carr Synopsis Elem. Results Math. II. Index 850/2 Astroid of a conic. 1921 Amer. Math. Monthly 28 94 The four-leaved clover is the pedal curve of the so-called four-cusped hypocycloid or astroid. 1991 D. Wells Penguin Dict. Curious & Interesting Geom. 10 Astroid or hypocycloid of four cusps..is the locus of a point on a circle rolling inside another circle four times its diameter. 2009 C. L. Diefenderfer & R. B. Nelsen Calculus Coll. 170 We can generate an abundance of rational points on astroids. This entry has been updated (OED Third Edition, March 2012; most recently modified version published online December 2021). < adj.n.1829
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