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  1. Oxford American Dictionary

    trilobite

    • IPA[ˈtrīləˌbīt]

    美式

    • n.
      an extinct marine arthropod that occurred abundantly during the Paleozoic era, with a carapace over the forepart, and a segmented hind part divided longitudinally into three lobes.

    • noun: trilobite, plural noun: trilobites