fric·a·tive 
(frĭkə-tĭv)
(frĭkə-tĭv)n.
A consonant, such as f or s in English, produced by the forcing of breath through a constricted passage. Also called spirant.
adj.
Of, relating to, or being a fricative consonant.
[New Latin fricātīvus, from Latin fricātus, past participle of fricāre, to rub.]