n. In pathology, a condition of the skin or some portion of it in which it sheds more or less fine bran-like scales.n. n. In ornithology, a genus of piping-crows of the family Corvidæ, founded by Lesson in 1837. The only species, P. gymnocephalus, inhabits Borneo and Sumatra.n. A scaly eczema. Also called eczema squamosum and psoriasis diffusa.