trocar

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tro·car

 (trō′kär′)
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; see trei- in Indo-European roots) + carre, side of an instrument (from Old French, from carrer, to square, from Latin quadrāre, from quadrum, square; see kwetwer- in Indo-European roots).]

trocar

(ˈtrəʊkɑː)
n
(Surgery) a surgical instrument for removing fluid from bodily cavities, consisting of a puncturing device situated inside a tube
[C18: from French trocart literally: with three sides, from trois three + carre side]

tro•car

(ˈtroʊ kɑr)

n.
a sharp-pointed surgical instrument enclosed in a cannula, used for withdrawing fluid from a cavity, as the abdominal cavity.
[1700–10; earlier trocart < French, literally, three-sided]