| n. | 1. | (Med.) An abnormal thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction. |
| Noun | 1. | pachyderma - thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction Synonyms: nevoid elephantiasis |