noun Slang.
a stupid, irritating, ineffectual, or unattractive person.
an intelligent but single-minded person obsessed with a nonsocial hobby or pursuit: a computer nerd.
Also, nurd.

1960–65, Americanism; obscurely derived expressive formation Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nerd or nurd (nɜːd)
1.  a boring or unpopular person, esp one obsessed with something specified: a computer nerd
2.  a stupid and feeble person
nurd or nurd
'nerdish or nurd
'nurdish or nurd
'nerdy or nurd
'nurdy or nurd

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  nerd1
Part of Speech:  n
Definition:  See gearhead's 21st Century Lexicon
Copyright © 2003-2014, LLC
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Word Origin & History

1951, U.S. student slang, probably an alteration of 1940s slang nert "stupid or crazy person," itself an alteration of nut. The word turns up in a Dr. Seuss book from 1950 ("If I Ran the Zoo"), which may have contributed to its rise. Adjective nerdy is from 1978.
Online Etymology Dictionary, © 2010 Douglas Harper
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Slang Dictionary

nerd definition

and nurd
  1. n.
    a dull and bookish person, usually a male. : That whole gang of boys is just a bunch of nurds.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
They are the refuge and the delight of every geek, nerd, lab and library rat.
It doesn't even have anything to do with whether you're a bookworm or a nerd or
  a geek.
He likes to call himself “one tough nerd”.
It was probably the most pivotal day of my life—saved me from being a
  terminal nerd.
Related Words
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