hypocycloid Geom.
(hɪpəʊ-, haɪpəʊˈsaɪklɔɪd)
[f. hypo- 2 + cycloid. Cf. F. hypocycloïde.]
A curve traced by a point in the circumference of a circle which rolls round the interior circumference of another circle (cf. epicycloid).
| 1843 [see hypotrochoid]. 1854 Moseley Astron. lxi. (ed. 4) 183 This curve..being of the nature of an hypocycloid. 1879 Thomson & Tait Nat. Phil. I. i. §94 The curve..is called an Epicycloid, or a Hypocycloid, as the rolling circle is without or within the fixed circle. |
Hence hypocyˈcloidal a., of the nature or form of a hypocycloid.
| 1884 F. J. Britten Watch & Clockm. 288 The pinion flanks should be hypocycloidal in form. |