| 单词 | planetesimal |
| 释义 | Word Frequency planetesimal(ˌplænɪˈtɛsɪməl) astronomy noun 1. any of a number of small bodies formerly thought to have been drawn from the sun by the close passage of a star to the sun, eventually coalescing to form the planets an icy planetesimal adjective 2. of or relating to planetesimals planetesimal theory/hypothesis/size Word origin C20: from planet + infinitesimal |
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