Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A smart aleck.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun informal A self-assertive and arrogant person; a know-it-all or smart aleck.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun an upstart who makes conceited, sardonic, insolent comments

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[wise + German -enheimer (in such surnames as Oppenheimer).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

wise + German surname suffix -enheimer

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