Strong consonant

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• Fricative
• Speech sound
• Consonant such as "f" or "v"
• A continuant consonant produced by breath moving against a narrowing of the vocal tract

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
breathy consonant, 1862, from Latin spirantem (nominative spirans ) "breathing," present participle of spirare "to breathe, blow" (see spirit (n.)).

WordNet Word definitions in WordNet
adj. of speech sounds produced by forcing air through a constricted passage (as `f', `s', `z', or `th' in both `thin' and `then') [syn: fricative , sibilant ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Spirant \Spi"rant\, n. [L. spirans, -antis, p. pr. of spirare to breathe. See Spirit .] (Phon.) A term used differently by different authorities; -- by some as equivalent to fricative, -- that is, as including all the continuous consonants, except the nasals ...