astroid [as-troid] Word Origin noun Geometry.

  1. a hypocycloid with four cusps.

Origin of astroid astr(o)- + -oid British Dictionary definitions for astroid astroid noun

  1. maths a hypocycloid having four cusps

Word Origin for astroid C19: from astro- + -oid Word Origin and History for astroid adj.

“star-shaped,” 1897, from Greek astroeides, from astron “star” (see astro-) + -oeides (see -oid).

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