1. Physical Chemistry a semirigid colloidal dispersion of a solid with a liquid or gas, as jelly, glue, or silica gel.
2. a cosmetic preparation with a gel-like consistency, such as a hair gel or a skin cleanser.
-- verb ( gelled, gelling )
-- verb (i)
3. to form or become a gel.
-- verb (t)
4. to style (a hairdo) with the use of gel.
[short for GELATINE ]