planetesimal
planetesimal[ˌplanɪˈtɛsɪm(ə)l](Astronomy)(天文)noun- a minute planet; a body which could come together with many others under gravitation to form a planet
星子
adjective- [attrib.]denoting or relating to such bodies
星子的
语源- early 20th cent.: from planet, on the pattern of infinitesimal
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