the part of calculus that deals with the variation of a function with respect to changes in the independent variable (or variables) by means of the concepts of derivative and differential

the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx

a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves

a quality that differentiates between similar things

a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body

an incrustation that forms on the teeth and gums

the branch of mathematics that is concerned with limits and with the differentiation and integration of functions