n. [ L. cannula a small tube of dim. of canna a reed, tube. ] (Surg.) A small tube of metal, wood, or India rubber, used for various purposes, esp. for injecting or withdrawing fluids. It is usually associated with a trocar.
a. Having the form of a tube; tubular.
a. Hollow; affording a passage through its interior length for wire, thread, etc.;