Meaning of planetesimal

plan•e•tes•i•mal

Pronunciation: (plan"i-tes'u-mul), [key]
— Astron. Astron.
—n.
  1. one of the small celestial bodies that, according to one theorywere fused together to form the planets of the solar system.
—adj.
  1. of or pertaining to a planetesimal or planetesimals.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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