plural noun Arc·to·cy·on·i·dae

Definition of Arctocyonidae

  1. :  a family of primitive generalized early Tertiary mammals that may belong to the direct ancestral line of the Carnivora

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Origin and Etymology of arctocyonidae

New Latin, from Arctocyon, type genus (from arct- + Greek kyōn dog) + -idae

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feeling or affected by lethargy

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