Entry 1 sense Webster, 1913 Explorer /ĭk-splôr'-ẽr/ · Ex·plor·er · IPA /ɛkˈsplɔːɹə(ɹ)/ 01 n. One who explores; also, an apparatus with which one explores, as a diving bell. 1. One who explores; also, an apparatus with which one explores, as a diving bell.