Definition of astroid in English:

astroid

Syllabification: as·troid
Pronunciation: /ˈastroid
 
/

noun

Mathematics
  • A hypocycloid with four cusps (like a square with concave sides).
    More example sentences
    • 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.

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