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Wiktionary
nasal consonant

n. A consonant sound produced by air moving though the nose with the mouth passage occluded. Examples of this sound include the English sounds m, n, and ng.

WordNet
nasal consonant

n. a continuant consonant produced through the nose with the mouth closed [syn: nasal]

Wikipedia
Nasal consonant

In phonetics, a nasal, also called a nasal occlusive, nasal stop in contrast with a nasal fricative, or nasal continuant, is an occlusive consonant produced with a lowered velum, allowing air to escape freely through the nose. Examples of nasals in English are and , in words such as nose and mouth. Nasal occlusives are nearly universal in human languages. There are also other kinds of nasal consonants in some languages.