MICR-

or micro- combining form Etymology: Middle English micro-, from Latin, from Greek mikr-, mikro-, from mikros, smikros small, short; perhaps akin to Old English smēalīc careful, exquisite 1. small ; minute , used for or involving minute quantities or variations , one millionth (10 -6 ) part of , 3. using microscopy , revealed by or having the structure discernible only by microscopic examination , abnormally small , of or relating to a small area , employed in or connected with microphotographing or microfilming