The Collaborative International Dictionary of English v.0.48:
Nasal \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
3. (Anc. Armor) Part of a helmet projecting to protect the
nose; a nose guard.
4. (Anat.) One of the nasal bones.
5. (Zool.) A plate, or scale, on the nose of a fish, etc.