Main Entry: post·op·er·a·tive Pronunciation: 'pOst-'äp-(&-)r&t-iv Function: adjective 1: relating to,occurring in, or being the period following a surgical operation <postoperative care> <postoperative complications> postoperative day> 2: having recently undergone a surgical operation postoperative patient> —post·op·er·a·tive·lyadverb