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	infolded infolding infoliate infoliation infoline infolio infomania infomaniac infomediary infomercial infonaut infooted infopreneur infopreneurial in for a penny, in for a pound in force inforestation inform informable informal informalise informality informalize informally informal settlement

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