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1. Oxford American Dictionary

   planetesimal

   • IPA[ˌplanəˈtesəm(ə)l]

   美式

   • n.
     a minute planet; a body that could or did come together with many others under gravitation to form a planet.
   • adj.
     relating to planetesimal bodies

   • noun: planetesimal, plural noun: planetesimals

2. • 釋義

   n.

   名詞

   • 1. a minute planet; a body that could or did come together with many others under gravitation to form a planet.

   adj.

   形容詞

   • 1. relating to planetesimal bodies the planetesimal material orbiting the sun