continuant

adj. of or pertaining to a continuant, of a consonant which may be prolonged without changing the sound (Phonetics)

n. consonant which may be prolonged without changing the sound (Phonetics)

A continuant is a sound produced with an incomplete closure of the vocal tract. That is, any sound except a stop (plosive or nasal). An affricate is considered to be both stop and continuant.
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Noun
1. consonant articulated by constricting (but not closing) the vocal tract
(synonym) continuant consonant
(hypernym) consonant
(hyponym) fricative consonant, fricative, spirant

v. continue, keep going, carry on; pursue, keep on, proceed; hold on, press on, stay; maintain, keep up

(n.)
A continuant sound; a letter whose sound may be prolonged.
  

(a.)
Continuing; prolonged; sustained; as, a continuant sound.