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(rare) a person displaying eccentric behaviour and mental characteristics that approach the psychotic
Word Origin
C19: from Italian, from matto insane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for mattoid
Historical Examples
  • I thought at first you were a mattoid, but you're so amazingly consistent.

    The Wonderful Visit Herbert George Wells
  • These mattoid scientists make a direct and disastrous attack upon the latent self-respect of criminals.

    Mankind in the Making H. G. Wells

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