placoid

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adjective plac·oid \ˈpla-ˌkȯid\

Definition of placoid

  1. :  of, relating to, or being a scale of dermal origin with an enamel-tipped spine characteristic of the elasmobranchs

Origin and Etymology of placoid

Greek plak-, plax flat surface


First Known Use: 1842


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a dividing ridge between drainage areas

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