Source : Webster's Revised Unabridged Dictionary (1913)

Affricate \Af"fri*cate\, n. [L. affricatus, p. p. of affricare
   to rub against; af- = ad- + fricare to rub.] (Phon.)
   A combination of a stop, or explosive, with an immediately
   following fricative or spirant of corresponding organic
   position, as pf in german Pfeffer, pepper, z (= ts) in German
   Zeit, time.

Source : WordNet®

affricate
     n : a composite speech sound consisting of a stop and a
         fricative articulated at the same point (as `ch' in
         `chair' and `j' in `joy') [syn: {affricate consonant}, {affricative}]