trocar
noun
tro·car ˈtrō-ˌkär 
variants or less commonly trochar
: a sharp-pointed surgical instrument fitted with a cannula and used especially to insert the cannula into a body cavity as a drainage outlet
Example Sentences
Recent Examples on the Web The funeral director then removes excess fluids and gases from the abdominal and thoracic cavities using an instrument called a trocar. 
Mark Evely, The Conversation, 15 Sep. 2020
Mark Evely, The Conversation, 15 Sep. 2020 Word History
Etymology
French trocart, alteration of trois-quart from trois three + carre edge
First Known Use
circa 1706, in the meaning defined above
Medical Definition
trocar
noun
tro·car
variants also trochar
ˈtrō-ˌkär
: a sharp-pointed surgical instrument fitted with a cannula and used especially to insert the cannula into a body cavity as a drainage outlet