PLANETESIMAL

planetesimal

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

Source: WordNet® 3.1

Etymology

Noun

planetesimal (plural planetesimals)

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

Adjective

planetesimal (not comparable)

(astronomy) Being or relating to one of these astronomical objects.

Source: Wiktionary

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