A scale.
Latin squama, scale.
The adjective squamous can refer to something having scales (Squamata is a taxonomic order that includes the snakes and lizards), to a layer of tissue that consists of very thin flattened cells (as in squamous cell carcinoma, a form of skin cancer), or the flat portion of the temporal bone which forms part of the side of the skull. The adjective squamocolumnar refers to a junction between layers of stratified squamous cells and columnar cells in epithelial tissue; a squamule is a small scale.
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