trocar

n.
A sharp-pointed surgical instrument, used with a cannula to puncture a body cavity for fluid aspiration.

[French trocart : trois, three (from Old French , from Latin trēs) + carre, side of an instrument (from Old French , from carrer, to square , from Latin quadrāre , from quadrum, square).]

(trō'kär')
n.

A sharp-pointed surgical instrument, used with a cannula to puncture a body cavity for fluid aspiration.

A sharp-pointed, needle-like instrument equipped with a cannula; used to puncture the wall of a body cavity and withdraw fluid or gas. An especially large bore trocar and cannula, 1.0 to 1.5 cm diameter, is used in the treatment of bloat in cattle.

• bleeding t. — a large bore, about 10 gauge, needle with a ferruled hub for the attachment of rubber tubing.
• Duchenne's t. — a trocar for obtaining specimens of deep-seated tissues.