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Definition of SMOOTH
a (1): having a continuous even surface (2)of a curve: being the representation of a function with a continuous first derivative (3): having or being a short even coat of hair <a smooth collie> — compare rough, wirehaired
: forming or being a colony with a flat shiny surface usually made up of organisms that form no chains or filaments, show characteristic internal changes, and tend toward marked increase in capsule formation and virulence—used of dissociated strains of bacteria; compare rough