单词	astroid
释义	astroid /ˈastrɔɪd / noun Mathematics A hypocycloid with four cusps (like a square with concave sides).The astroid was first discussed by Johann Bernoulli in 1691-92.... The caustic of the tricuspoid, where the rays are parallel and in any direction, is an astroid. The cycloidal curves, including the astroid, were discovered by Roemer (1674) in his search for the best form for gear teeth.
随便看	abbatical Abbe condenser Abbe, Ernst Abbe number Abbe refractometer Abbe's condenser Abbe's refractometer abbess Abbevillian abbey abbey church abbeyed abbey laborer abbey labourer abbey laird abbey land abbey-like abbey-lubber abbey man abbey piece Abbey Road abbey-stead abbot abbot-bishop abbotcy

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