n. In botany, a scale of any sort, usually the homologuo of a leaf.n. In anatomy and zoology: A scale, as of the epidermis.n. A thin, expansive, scalelike part of a bone: as, the squama of the temporal bone (the squamosal); the squama of the occipital bone (the supra-occipital).n. In ornithology, a scale-like feather, as one of those upon a penguin's wing or the throat of a humming-bird. See cut under Squamipennes.n. In entomology, an elytrum.n. The scale-like exopodite of a crustacean antenna.