Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of innumerable small bodies thought to have orbited the sun during the formation of the planets.

from The Century Dictionary.

  • Of or pertaining to a minute planet or planetary body.
  • noun One of the minute bodies moving in planetary orbits, from time to time overtaking each other and coalescing, and so gradually building up the planets, according to the planetesimal hypothesis.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun astronomy Any of many small, solid astronomical objects, that orbit a star and form protoplanets through mutual gravitational attraction

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[planet + (infinit)esimal.]

Examples

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