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carb1

[kahrb]
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noun Informal.
  1. a carburetor.

Origin of carb1

First recorded in 1950–55; by shortening

carb2

[kahrb]Slang.
noun
  1. carbohydrate.
verb (used without object)
  1. to eat large quantities of carbohydrates before a major physical exertion in order to store up energy (usually followed by up): Some marathon runners carb up on spaghetti the night before a race.

Origin of carb2

by shortening of carbohydrate

carb-

  1. variant of carbo- before a vowel: carbazole.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for carb

carb

noun
  1. short for carburettor
  2. short for carbohydrate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for carb

n.

1942 as an abbreviation of carburetor; c.2000 as short for carbohydrate.

Online Etymology Dictionary, © 2010 Douglas Harper

carb in Medicine

carb-

pref.
  1. Variant ofcarbo-