I. ˈkaˌlōs adjective
Etymology: International Scientific Vocabulary call- (from Latin callum hard skin) + -ose; originally formed in French — more at callous
: having protuberant hardened spots
callose leaves
II. noun
( -s )
Etymology: Latin callosus callous
: a carbohydrate component of cell walls that is readily stained by aniline blue and is found especially on sieve plates where it forms the callus