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pachydermous

pachydermous, a. rare.
  (pækɪˈdɜːməs)
  [f. as pachyderm + -ous.]
  Thick-skinned, pachydermatous. b. Bot. Thick-coated.

1836 Encycl. Brit. (ed. 7) XIV. 146/2 The removal of the genus Equus..would enable us to simplify our definition of the pachydermous tribes.

Oxford English Dictionary

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