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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.
laboratory apparatus used in quantitative chemical analysis to measure the volume of a liquid or a gas. It consists of a graduated glass tube with a stopcock (turning plug, or spigot) at one end. On a liquid burette, the stopcock is at the bottom, and the precise volume of the liquid dispensed can be determined by reading the graduations marked on the glass tube at the liquid level before and after dispensing it. In a gas burette, the stopcock is at the top; the tube of the burette is filled with a fluid, such as water, oil, or mercury, and the bottom of the tube is attached to a reservoir of the fluid. Gas is collected by displacing fluid from the burette, and the amount of gas is measured by the volume of fluid displaced.