"Spirant" is a word in ENGLISH

A term used differently by different authorities; -- by
some as equivalent to fricative, -- that is, as including all the
continuous consonants, except the nasals m, n, ng; with the further
exception, by others, of the liquids r, l, and the semivowels w, y; by
others limited to f, v, th surd and sonant, and the sound of German ch,
-- thus excluding the sibilants, as well as the nasals, liquids, and
semivowels. See Guide to Pronunciation, // 197-208.