Meaning of slit fricative

slit' fric"ative

Pronunciation: [key]
— Phonet. Phonet.
  1. a fricative, as (f&hasp;) or (th), in which the tongue is relatively flat, with air channeled over it through a shallow slit. Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.