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astroid

American  
[as-troid] / ˈæs trɔɪd /

noun

Geometry.

  1. a hypocycloid with four cusps.

astroid British  
/ ˈæstrɔɪd /

noun

  1. maths a hypocycloid having four cusps

"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

Etymology

Origin of astroid

astr(o)- + -oid

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

That makes the discovery of an astroid belt orbiting the star Fomelhaut all the more exciting.

From Salon • May 10, 2023

Armageddon – in which an astroid the size of Texas is blown to bits to save our planet – was the most surprising inclusion on the damned list, as Nasa originally supported the film.

From The Guardian • Jan. 5, 2011

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.