The Collaborative International Dictionary of English v.0.48:

Burette \Bu*rette"\, n. [F., can, cruet, dim. of buire flagon.]
   (Chem.)
   An apparatus for delivering measured quantities of liquid or
   for measuring the quantity of liquid or gas received or
   discharged. It consists essentially of a graduated glass
   tube, usually furnished with a small aperture and stopcock.
   [1913 Webster]

WordNet (r) 3.0 (2006):

burette
    n 1: measuring instrument consisting of a graduated glass tube
         with a tap at the bottom; used for titration [syn:
         burette, buret]