workaholic

[wurk-uh-haw-lik, -hol-ik]
noun
a person who works compulsively at the expense of other pursuits.

Origin:
1965–70; work + -aholic

workaholism, noun
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World English Dictionary
workaholic (ˌwɜːkəˈhɒlɪk)
 
n
a.  a person obsessively addicted to work
 b.  (as modifier): workaholic behaviour
 
[C20: from work + -holic, coined in 1971 by Wayne Oates, US author]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

workaholic
1968, coined from work (n.) with second element abstracted absurdly from alcoholic, setting up the Rodney Dangerfield joke, "My old man was a workaholic: every time he thought about work, he got drunk."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

workaholic work·a·hol·ic (wûr'kə-hô'lĭk)
n.
One who has a compulsive and unrelenting need to work.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
And no one gives a thought to the workaholic, single-minded quality of their
  lives.
He is an impetuous, headstrong workaholic, who is reluctant to delegate.
But he is actually a workaholic with an obsessive-compulsive streak.
But probably the bigger reason is that he is an intense workaholic, and resents
  anything that takes him away from his work.
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