planetesimal.
Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.
Meaning & usage
Any of many small, solid astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction.
Where this word comes from
Formed from planet by analogy with infinitesimal.
Being or relating to one of these astronomical objects.
Where this word comes from
Formed from planet by analogy with infinitesimal.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.