1650s, "of the nose," from French nasal, from Latin nasus "nose, the nose, sense of smell," from PIE *nas- (see nose (n.)). Of speech sounds, attested from 1660s. As a noun, "nasal letter or sound," from 1660s. Related: Nasality; nasalization.
nasal na·sal (nā'zəl)
Of, in, or relating to the nose.