ellipsoidn.adj.
/ɛˈlɪpsɔɪd/ A. n.
1. A solid of which all the plane sections through one of the axes are ellipses, and all other sections ellipses or circles. Formerly in narrower sense: A solid generated by the revolution of an ellipse round one of its axes; now called ellipsoid of revolution.
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the world > relative properties > number > geometry > shape or figure > [noun] > three-dimensional > sphere > spheroid
tun form1551
spheroid1664
prolate spheroid1724
ellipsoid1734
geoid1880
the world > space > shape > curvature > curved three-dimensional shape or body > [noun] > sphericity or globularity > spheroidicity > spheroid > types of
prolate spheroid1724
ellipsoid1734
ovoid1778
ovaloid1899
1734 tr. P. L. M. de Maupertuis Diss. Cœlestial Bodies 7 in J. Keill Exam. Burnet's Theory of Earth (ed. 2) The Earth must be an Ellipsoid whose Equatorial Diameter is to its Axis as √289 to √288.
1787 Philos. Trans. (Royal Soc.) 77 202 Ellipsoids of different degrees of oblateness.
1831 D. Brewster Treat. Optics vi. 55 A meniscus whose convex surface is part of an ellipsoid.
1871 B. Stewart Heat (ed. 2) §281 The isothermal surfaces are ellipsoids.
1879 C. Niven (title) On the Conduction of Heat in Ellipsoids of Revolution.
2. ? A figure approximately elliptical.
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1837 W. Whewell Hist. Inductive Sci. II. iv. v. 74 An ‘eccentric ellipsoid’; that is a figure resembling an ellipse.
B. adj.
= ellipsoidal adj.
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the world > space > shape > curvature > roundness > [adjective] > oval or elliptical
avelong1440
wrongc1440
oval1561
ellipsical1571
elliptical1656
round-long1663
elliptic1715
ovated1752
ovate1760
ovoid1776
ellipsoidal1831
dromic1850
oliviform1857
ellipsoid1861
vesical1865
dromical1875
the world > space > shape > curvature > curved three-dimensional shape or body > [adjective] > spherical or globular > spheroidal > oval, ovoid, or ellipsoidal
oval1585
egg-like1599
ovalish1684
oviform1684
subovate1752
egg-shaped1767
almond-shapeda1771
subovated1773
ovicular1774
ovate1775
ovoid1776
egg-oblong1796
subovoid1819
ovaliform1826
ovoidal1828
ellipsoidal1831
amygdaloid1835
ooidal1836
oliviform1857
ovoid-shaped1860
ellipsoid1861
ovaloid1890
1861 R. T. Hulme tr. C. H. Moquin-Tandon Elements Med. Zool. ii. vi. i. 313 The eggs..are ellipsoid or oval.
1870 J. D. Hooker Student's Flora Brit. Islands 142 Styles erect or spreading, pollen ellipsoid.
This entry has not yet been fully updated (first published 1891; most recently modified version published online December 2018).
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n.adj.1734