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astroid

[as-troid]
noun Geometry.
  1. a hypocycloid with four cusps.
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Origin of astroid

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for astroid

astroid

noun
  1. maths a hypocycloid having four cusps
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Word Origin

C19: from astro- + -oid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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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Online Etymology Dictionary, © 2010 Douglas Harper