Entry 1 sense Webster, 1913 Exterminator /ĭk-stẽrm'-ən-ātˌ-ẽr/ · Ex·ter·mi·na·tor · IPA /ɪkˈstɝmɪˌneɪtɚ/ 01 n. One who, or that which, exterminates. 1. One who, or that which, exterminates.