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	bonk bonkbuster bonkers bon mot Bonn Bonnard, Pierre bonne bonne bouche bonne femme bonnet bonneted bonnethead bonnethead shark bonnet macaque bonnet monkey bonnetmouth Bonneville Dam Bonneville Salt Flats Bonney, William H. bonnie bonnily bonniness bonny bonny clabber bonobo

英语词典包含243303条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。