One of the mysteries of the English language finally explained.
A polysaccharide found in higher plants as a constituent of certain types of cell wall, and deposited on parts of the plasma membrane in response to wounding or physiological stress.
Originally: (of animal tissue or skin) hardened, thickened; = "callous". In later use also Botany: bearing one or more callosities.
Late 19th century. From French callose from classical Latin callus + French -ose<br>late Middle English; earliest use found in Lanfranc's Science of Cirurgie. From classical Latin callōsus callous.
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