Usually means: Eccentric person with defective behavior.
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We found 10 dictionaries that define the word mattoid:

General (9 matching dictionaries)
  1. mattoid: Collins English Dictionary
  2. mattoid: Wordnik
  3. mattoid: Wiktionary
  4. mattoid: Webster's New World College Dictionary, 4th Ed.
  5. mattoid: Dictionary.com
  6. mattoid: FreeDictionary.org
  7. mattoid: The Phrontistery - A Dictionary of Obscure Words
  8. mattoid: TheFreeDictionary.com
  9. Mattoid: World Wide Words

Medicine (1 matching dictionary)
  1. mattoid: Merriam-Webster Medical Dictionary

Definitions from Wiktionary (mattoid)

adjective:  Displaying erratic behaviour
noun:  A person who displays such behaviour; a person of congenitally abnormal mind bordering on insanity or degeneracy.

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