trocar noun. ['trǝʊkɑ:] E18.
[French trocart, also trois-quarts, from trois three + carre (Latin quadra) face of an instrument, so called from its triangular form.]
Medicine. A surgical instrument consisting of a shaft with a three-sided cutting point, enclosed in a cannula and used to introduce this into a body cavity for withdrawal of fluid, as in ascites etc.

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