An Iwaidjan Australian Aboriginal language spoken on Croker and Melville Islands off the north coast of Arnhem Land in the Northern Territory.

(chemistry) A thick oily liquid, H₂S₂O₇.

(organic chemistry) Alternative form of amidium ion

A notching, like that between the teeth of a saw, in the edge of anything. / One of the teeth in a serrated edge; a serration.