heterology

noun

1. (countable, uncountable)A lack of correspondence between biomolecules or body parts (e.g., proteins, tissues, bones, limbs) that reflects a difference in origin.
2. (countable, uncountable)The property of a word or phrase that does not describe itself.

   “The words ultrashort and onomatopoeia display heterology: ultrashort might be called short but is not an ultrashort word, and onomatopoeia is not an onomatopoeic word.”