Characterized by friction: said of those alphabetic sounds in which the conspicuous element is a rustling of the breath through a partly opened position of the organs, as s and sh, z and zh, f and v, th and Ŧh, and so on. They are sometimes divided into subclasses, as sibilants, like s and sh, and spirants, like f and verbSounded by friction, as certain musical instruments. See instrument, 3 .n. A fricative consonant. See I., 1.