pachydermous,a.rare.|pækɪˈdɜːməs| [f. as pachyderm + -ous.] Thick-skinned, pachydermatous. b.Bot. Thick-coated. 1836Encycl.Brit. (ed. 7) XIV. 146/2 The removal of the genus Equus..would enable us to simplify our definition of the pachydermous tribes.