planetesimal
plan·e·tes·i·mal
noun \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
See Origin of PLANETESIMAL
planet + -esimal (as in infinitesimal)
First Known Use: 1903
Rhymes with PLANETESIMAL
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