| 单词 | planetesimal |
| 释义 | planetesimal /plan'i tes"euh meuhl/, Astron. n. 1. one of the small celestial bodies that, according to one theory (planetesimal hypothesis), were fused together to form the planets of the solar system. adj. 2. of or pertaining to a planetesimal or planetesimals. [1900-05; PLANET + (INFINIT)ESIMAL] |
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