Webster's English Dictionary

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fricative

1. fric.a.tive \'frik-*t-iv\ aj [L fricatus, pp. of fricare] : 
   characterized by frictional passage of the expired voiced or voiceless  
   breath against a narrowing at some point in the vocal tract {/f v th th s z 
   sh zh h/ are ~}
2. fricative n : a fricative consonant