a temporary fashion, notion, manner of conduct, etc., especially one followed enthusiastically by a group.

1825–35; noun use of dial. fad to look after things, busy oneself with trifles, back formation from obsolete faddle to play with, fondle. See fiddle

fadlike, adjective

craze, vogue, rage.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fad (fæd)
1.  an intense but short-lived fashion; craze
2.  a personal idiosyncrasy or whim
[C19: of uncertain origin]

biochem See also FMN flavin adenine dinucleotide: an ester of riboflavin with ADP that acts as the prosthetic group for many flavoproteins

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1834, "hobby, pet project;" 1881 as "fashion, craze," perhaps shortened from fiddle-faddle. Or perhaps from Fr. fadaise "trifle, nonsense," ult. from L. fatuus "stupid."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

FAD abbr.
flavin adenine dinucleotide

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

FAD definition

["FAD, A Simple and Powerful Database Language", F. Bancilon et al, Proc 13th Intl Conf on VLDB, Brighton, England, Sep 1987].

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
  1. fish aggregating device

  2. flavin adenine dinucleotide

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
It's not a new fad diet, but part of a strategy for battling the spike in
  energy costs.
The latest exchange-rate fad in emerging economies is for flexible currencies,
  but fixed inflation targets.
Since then, it has become something of a national fad.
Twitter and their cousins have evolved from college fad to global ubiquity in
  seven short years.
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