Having the quality of cutting into or dividing the substance of anything; cutting, or used for cutting: as, the incisive teeth.Figuratively, sharply and clearly expressive; penetrating; trenchant; sharp; acute.Having the power of breaking up or dissolving viscid or coagulated humors.In anatomy and zoology: Having the character, function, or situation of an incisor tooth; incisorial.Pertaining in any way to an incisor; situated near incisors; containing incisors: synonymous with premaxillary or intermaxillary and prepalatine.n. In entomology, the incisive edge of the mandible of a beetle. See incisive edge, above.