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astroid

[as-troid] /ˈæs trɔɪd/
noun, Geometry
1.
a hypocycloid with four cusps.
Origin
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for astroid

astroid

/ˈæstrɔɪd/
noun
1.
(maths) a hypocycloid having four cusps
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
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Word Origin and History for astroid
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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