Rare term for any legless, burrowing amphibian of the order Gymnophiona. Often encountered in biological contexts; the cross-reference 足無井守 (あしなしいもり) is a more common synonym.
See also: アシナシイモリ
Caecilians are legless amphibians that live in tropical regions.
Compound of 裸 (はだか, 'naked') and 蛇 (へび, 'snake'), referring to the caecilian's snake-like, limbless body. The exact historical derivation is uncertain.