conoidaladj.
/kəʊˈnɔɪd(ə)l/ 1. Geometry. Pertaining to, or of the form of, a conoid (in its various senses). conoidal cusps (in Optics), the name given by Sir W. R. Hamilton to the singular points or conical points of the wave-surface.
ΘΚΠ
the world > space > shape > curvature > curved three-dimensional shape or body > [adjective] > solid of revolution having conic section
conoidal1571
paraboloidal1825
paraboloid1831
the world > relative properties > number > geometry > shape or figure > [adjective] > three-dimensional > conical
conic1570
conical1570
conoidal1571
1571 T. Digges in L. Digges's Geom. Pract.: Pantometria Pref. sig. T j Not onely..Theorems of spherall solides, but also of Conoydall, Parabollical, Hyperbollical, and Ellepseycal circumscribed & inscribed bodies.
1837 C. Babbage 9th Bridgewater Treat. viii. 104 The curve surface..had four conoidal cusps, at each of which there were, consequently, an infinite number of tangent planes.
1865 W. S. Aldis Elem. Solid Geom. §144 A conoidal surface is a surface generated by a straight line which always meets a fixed straight line, is parallel to a fixed plane, and meets a fixed curve.
2. in gen. use. Approaching in shape to a cone; nearly but not exactly conical.
ΘΚΠ
the world > space > shape > curvature > curved three-dimensional shape or body > [adjective] > conical > conoid
conoid1668
conoidal1741
1741 A. Monro Anat. Human Bones (ed. 3) 25 The Figure..is somewhat conoidal.
1842 H. Miller Old Red Sandstone (ed. 2) xi. 233 Conoidal hills, bare of soil.
1865 Pall Mall Gaz. 29 Aug. 10/2 The new musket, adapted to conoidal shot.
Derivatives
coˈnoidally adv.
This entry has not yet been fully updated (first published 1891; most recently modified version published online June 2018).
<
adj.1571