Adjective spirant has 1 sense
  1. fricative, sibilant, spirant - of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then')
    Antonym: hard (indirect, via soft)
,Noun spirant has 1 sense
  1. fricative consonant, fricative, spirant - a continuant consonant produced by breath moving against a narrowing of the vocal tract
    --1 is a kind of continuant consonant, continuant
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