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Aten asteroid

American  

noun

Astronomy.

  1. one of a small group of asteroids whose orbits cross that of the earth and whose semimajor axes are smaller than that of the earth.

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.