morpheme

n. smallest meaningful language unit (Morphology)

In morpheme-based morphology, a morpheme is the smallest linguistic unit that has  semantic meaning. In spoken language, morphemes are composed of phonemes (the smallest linguistically distinctive units of sound), and in written language morphemes are composed of graphemes (the smallest units of written language).
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Noun
1. minimal meaningful language unit; it cannot be divided into smaller meaningful units
(hypernym) language unit, linguistic unit
(hyponym) allomorph

n. morpheme, smallest meaningful language unit (Morphology)

adj. morphemic, of or about the smallest meaningful language unit (Morphology)

n. morpheme, smallest meaningful language unit (Morphology)