Denasal

In phonetics, denasalization is the loss of nasal airflow in a nasal stop or nasal vowel. This may be due to speech pathology, but also occurs when the sinuses are blocked from a cold, in which case it is called a 'nasal voice'. (The latter is not a linguistic term.) The symbol for this in the Extended IPA is.

When speaking with a head cold, the nasal passages still function as a resonant cavity, so a denasalized nasal stop does not sound like a voiced oral stop, and a denasalized vowel  does not sound like an oral vowel.

However, there are cases of historical or allophonic denasalization which have produced oral stops. In some languages with nasal vowels, such as Paicĩ, nasal stops may occur only before nasal vowels; while before oral vowels, prenasalized stops are found. This allophonic variation is likely to be due to a historical process of partial denasalization. Similarly, several languages around Puget Sound underwent a process of denasalization about one century ago: Except in special speech registers, such as baby talk, the nasal stops became the voiced oral stops. It appears from historical records that there was an intermediate stage when these stops were prenasalized.

Difriadur Dénasalisation