Definition of astroid in English:

astroid

noun

Mathematics
  • A hypocycloid with four cusps (like a square with concave sides)

    • ‘The astroid was first discussed by Johann Bernoulli in 1691-92.’
    • ‘An astroid is a specialized case of the general hypocycloid family of curves.’
    • ‘The cycloidal curves, including the astroid, were discovered by Roemer (1674) in his search for the best form for gear teeth.’
    • ‘The caustic of the tricuspoid, where the rays are parallel and in any direction, is an astroid.’
    • ‘The astroid is a famous curve that arises in an interesting way.’

Pronunciation:

astroid

/ˈastroid/