n. A movable cover which closes an aperture or shuts in a cavity, and usually forms an integral part of the structure to which it belongs by being either attached or closely fitted to it: as, the lid of a tea-kettle, stove, chest, or desk.n. In botany, the upper section of a pyxis, which separates by a transverse line; also, the hood of the leaf in the pitcher-plants; in mosses, the operculum.n. An eyelid.n. In coal-mining, a short piece of timber placed on top of a prop to help in supporting the roof.n. A coverlet. —n. One of the covers or boards of a book: as, everything between the lids of the Bible.To put a lid on (something); put a cover on; hide.