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Definition of: pachyderm
(pak′ə·dûrm) noun
1. Any of certain thick-skinned, non-ruminant ungulates; especially, an elephant, hippopotamus, or rhinoceros: formerly included in the obsolete order Pachydermata, which embraced also the horse, pig, tapir, etc.
2. A stolid, thick-skinned, insensitive person. [<F pachyderme <Gk. pachydermos <pachys thick + derma skin]
—pach′y·der′ma·tous, pach′y·der′mous adjective
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