Na″sal, n. 1. An elementary sound which is uttered through the nose, or through both the nose and the mouth simultaneously.
2. (Med.) A medicine that operates through the nose; an errhine.
3. (Anc. Armor) Part of a helmet projecting to protect the nose; a nose guard.
4. (Anat.) One of the nasal bones.
5. (Zoöl.) A plate, or scale, on the nose of a fish, etc.