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单词 epicycloid
释义

WordReference Random House Unabridged Dictionary of American English © 2024
ep•i•cy•cloid  (ep′ə sī′kloid),USA pronunciation n. [Geom.]
  1. Mathematicsa curve generated by the motion of a point on the circumference of a circle that rolls externally, without slipping, on a fixed circle. Equation:x= (a + b) cos θ - b cos [(a + b)θ/b] and y = (a + b) sin θ - b sin [(a + b)θ/b]. Cf. epitrochoid.
  • epicycle + -oid 1780–90
ep′i•cy•cloi′dal, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::
epicycloid /ˌɛpɪˈsaɪklɔɪd/ n
  1. the curve described by a point on the circumference of a circle as this circle rolls around the outside of another fixed circle, the two circles being coplanar

ˌepicyˈcloidal adj
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更新时间：2025/7/23 15:52:41