GNU Collaborative International Dictionary of English

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Found one definition

1.       
   morpheme (môrfēm), n. (Linguistics) The smallest unit of meaning of a language, which cannot be divided into smaller parts carrying meaning; it is usually smaller than a single wordform, such as the -ed morpheme of verbs in the past tense or the -s morpheme of nouns in the plural form.
   
   [PJC]