n. [ Cf. F. pachyderme. ] (Zool.) Any of various nonruminant hoofed mammals having very thick skin, including the elephant, rhinoceros, and hippopotamus, one of the Pachydermata. [ WordNet 1.5 + 1913 Webster ]

n. (Med.) An abnormal thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction.
Syn. -- pachydermatosis, pachydermia, nevoid elephantiasis. [ WordNet 1.5 ]

a. (Zool.) Of or relating to the pachyderms; as, pachydermal dentition. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. pachy`dermos thick-skinned; pachy`s thick + de`rma skin. ] (Zool.) A group of hoofed mammals distinguished for the thickness of their skins, including the elephant, hippopotamus, rhinoceros, tapir, horse, and hog; the pachyderms. It is now considered an artificial group. [ 1913 Webster ]

n. (Med.) Same as pachyderma.
Syn. -- pachyderma, pachydermia, nevoid elephantiasis. [ WordNet 1.5 ]

a. 1. (Zool.) Of or pertaining to the pachyderms. [ 1913 Webster ]

2. Thick-skinned; not sensitive to ridicule. [ 1913 Webster ]

3. (Med.) Of or pertaining to pachyderma. [ PJC ]

n. (Med.) Same as pachyderma.
Syn. -- pachydermatosis, pachyderma, nevoid elephantiasis. [ WordNet 1.5 ]

a. [ Pachyderm + -oid. ] (Zool.) Related to the pachyderms. [ 1913 Webster ]