A word that does not apply to itself. Thus ‘long’ is not a long word; ‘antedeluvian’ is not an antedeluvian word. See Grelling's paradox.

non-self-descriptive (used by Hofstadter to describe words such as monosyllabic and long)

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The adjective has one meaning:

Meaning #1: (biology) not corresponding in structure or evolutionary origin
  Synonyms: heterologous, heterologic

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