#morpheme  minimal meaningful language unit; it cannot be divided into smaller meaningful units
  supertype:  language_unit__linguistic_unit  one of the natural units into which linguistic messages can be analyzed
  subtype:  allomorph  a variant phonological representation of a morpheme: "the final sounds of `bets' and `beds' and `horses' and `oxen' are allomorphs of the English plural morpheme"
     subtype:  morphophoneme  (linguistics) the phonemes (or strings of phonemes) that constitute the various allomorphs of a morpheme
  subtype:  free_morpheme__free_form  a morpheme that can occur alone
  subtype:  bound_morpheme__boundmorpheme__bound_form__boundform  a morpheme that occurs only as part of a larger construction; eg an -s at the end of plural nouns
     subtype:  combining_form__combiningform  a bound form used only in compounds; "`hemato-' is a combining form in words like `hematology'"
     subtype:  affix  a linguistic element added to a word to produce an inflected or derived form
        subtype:  prefix  an affix that added in front of the word
           subtype:  alpha_privative__alphaprivative  the negative prefix a- or un-
        subtype:  suffix__ending  an affix that is added at the end of the word
           subtype:  inflectional_suffix  an inflection that is added at the end of a root word
        subtype:  infix  an affix that is inserted inside the word
  subtype:  classifier.word  a word or morpheme used in some languages in certain contexts (such as counting) to indicate the semantic class in which an item belongs

No statement uses or specializes morpheme; click here to add one.