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From 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. [1913 Webster] 2. (Med.) A medicine that operates through the nose; an errhine. [Archaic] [1913 Webster] 3. (Anc. Armor) Part of a helmet projecting to protect the nose; a nose guard. [1913 Webster] 4. (Anat.) One of the nasal bones. [1913 Webster] 5. (Zool.) A plate, or scale, on the nose of a fish, etc. [1913 Webster]