单词 | hypotrochoid |
释义 | hypotrochoidn. Geometry. The curve described by a point rigidly connected with the centre of a circle which rolls on the inside of another circle. 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 1843 Penny Cycl. XXV. 282/1 A class [of curves] called..hypotrochoids, of which one particular case is the hypocycloid. 1879 W. Thomson & P. G. Tait Treat. Nat. Philos. (new ed.) I: Pt. i. §94 When the tracing point is not in the circumference, we have Epitrochoids and Hypotrochoids. Derivatives hypotroˈchoidal adj. of the form of, or pertaining to, a hypotrochoid. ΘΚΠ the world > relative properties > number > geometry > curve > [adjective] > other caustic1728 hypotrochoidal1843 hodographic1847 Pippian1857 tetrazomal1867 trizomal1867 three-bar1875 sinusoidal1878 1843 Penny Cycl. XXV. 283/1 When the convexities are opposed, the trochoidal system is called epi-trochoidal, and when concavity fits convexity, hypo-trochoidal. This entry has not yet been fully updated (first published 1899; most recently modified version published online December 2019). < |
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