Definition of micromania in English:

micromania

Pronunciation /mʌɪkrə(ʊ)ˈmeɪnɪə/

noun

rare Medicine Psychiatry
  • The delusion that the body or part of it has become abnormally small. Also: a persistent or exaggerated tendency to belittle oneself or regard oneself as unimportant.

Origin

Late 19th century; earliest use found in The New Sydenham Society's Lexicon of Medicine and the Allied Sciences. From micro- + -mania.