a systematic method of diagnosing a disorder (e.g., headache) that lacks unique symptoms or signs
the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx
a quality that differentiates between similar things
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
identifying the nature or cause of some phenomenon
