[医] 皮肥厚, 厚皮

[ noun ]
thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction
<noun.state>

pachyderma \pachyderma\ (p[a^]k"[i^]*d[~e]r"m[.a]), 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]