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1836, from French burette "small vase, cruet," diminutive of buire "vase for liquors," in Old French "jug," variant of buie (12c.) "bottle, water jog," from Frankish *buk- or some similar Germanic source (see bucket (n.)). As a laboratory measuring tube, from 1836.
burette bu·rette or bu·ret (byu-rět')
A uniform-bore tube with fine gradations and a stopcock at the bottom, used especially in laboratory procedures for accurate fluid dispensing and measurement.