Gel

(noun) a colloid in a more solid form than a sol. Synonyms: gel, colloidal gel.

(noun) a thin translucent membrane used over stage lights for color effects. Synonyms: gelatin, gel.

(verb) become a gel. Synonyms: gel. Example: "The solid, when heated, gelled."

(verb) apply a styling gel to. Synonyms: mousse, gel. Example: "She mousses her hair."