Usually means: Highly intelligent and knowledgeable person.
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We found 18 dictionaries that define the word brainiac:

General (15 matching dictionaries)
  1. brainiac: Merriam-Webster
  2. brainiac: Oxford Learner's Dictionaries
  3. brainiac: American Heritage Dictionary of the English Language
  4. brainiac: Collins English Dictionary
  5. brainiac: Vocabulary.com
  6. Brainiac, brainiac: Wordnik
  7. brainiac: Wiktionary
  8. brainiac: Dictionary.com
  9. Brainiac (band), Brainiac (character), Brainiac (comics), Brainiac (disambiguation), Brainiac (story arc), Brainiac, The Brainiac: Wikipedia, the Free Encyclopedia
  10. BRAINIAC, Brainiac, brainiac: Stammtisch Beau Fleuve Acronyms
  11. brainiac: FreeDictionary.org
  12. brainiac: Mnemonic Dictionary
  13. Brainiac: The Word Detective
  14. brainiac: TheFreeDictionary.com
  15. brainiac: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)
  1. brainiac: Encyclopedia

Slang (2 matching dictionaries)
  1. brainiac: Green’s Dictionary of Slang
  2. brainiac: Urban Dictionary

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Definitions from Wiktionary (brainiac)

▸ noun:  (slang, sometimes derogatory) A very intelligent and usually studious, erudite person.

Similar:
brain, bubble brain, brainbox, beanbrain, birdbrain, shitbrain, cockbrain, nerdbrain, brains-truster, addle-brain, more...

Opposite:
dunce, simpleton, dullard, idiot, moron

Types:
genius, prodigy, savant, brainy, nerd, geek, intellectual, thinker, philosopher, more...

Phrases:
Brainiac 5, Brainiac 8, more...

Colors:
    electric blue,     neon green,     cyber yellow,     digital pink,     circuit board green, more...



▸ Words similar to brainiac

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▸ Idioms related to brainiac

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▸ Popular adjectives describing brainiac

▸ Words that often appear near brainiac

▸ Rhymes of brainiac

▸ Invented words related to brainiac

Similar:
brain, bubble brain, brainbox, beanbrain, birdbrain, shitbrain, cockbrain, nerdbrain, brains-truster, addle-brain, more...

Opposite:
dunce, simpleton, dullard, idiot, moron

Types:
genius, prodigy, savant, brainy, nerd, geek, intellectual, thinker, philosopher, more...

Phrases:
Brainiac 5, Brainiac 8, more...

Colors:
    electric blue,     neon green,     cyber yellow,     digital pink,     circuit board green, more...



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