neutrophile neut·rop·hile UK/ˈnuː.tɹoʊ̯ˌfaɪ̯ɫ/ uncommon noun 1. the chief phagocytic leukocyte; stains with either basic or acid dyes Synonymsneutrophil Related words Broader terms leukocyte Narrower terms microphage WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved.