First Known Use: 1903
Dictionary
planetesimal
noun plan·e·tes·i·mal \ˌpla-nə-ˈte-sə-məl, -zə-məl\
Definition of PLANETESIMAL
: any of numerous small celestial bodies that may have existed at an early stage of the development of the solar system
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Origin of PLANETESIMAL
planet + -esimal (as in infinitesimal)
Rhymes with PLANETESIMAL
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