A small solid body following a planetary orbit; a miniature planet; spec. each of the bodies hypothesized to have formed the planets by accretion.
| 单词 | θ709 | 
| 释义 | the world > the universe > planet > primary planet > miniature planet > 			[noun]		 (2)		 planetesimal1904 A small solid body following a planetary orbit; a miniature planet; spec. each of the bodies hypothesized to have formed the planets by accretion. planetismal1907 = planetesimal, n. | 
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