Entry 1 sense Webster, 1913 Separator /sĕp'-ər-ātˌ-ẽr/ · Sep·a·ra·tor · IPA /ˈsɛpəˌɹeɪtəɹ/ 01 n. One who, or that which, separates. 1. One who, or that which, separates.(Steam Boilers)