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Planetesimal

adj, noun

Definitions

Adjective
  1. 1
    Being or relating to one of these astronomical objects. not-comparable

    "a planetesimal body"

Noun
  1. 1
    Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.
  2. 2
    one of many small solid celestial bodies thought to have existed at an early stage in the development of the solar system wordnet

Etymology

Etymology 1

Formed from planet by analogy with infinitesimal.

Etymology 2

Formed from planet by analogy with infinitesimal.

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