Dictionary.com

carb

1
[ kahrb ]
/ kɑrb /
Informal.

noun

carbohydrate.

verb (used without object)

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.

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You may have read the word "simmer" in a recipe or two, but what does it really mean?
To cook in water that begins cold and then reaches a boil.
To stew in a sauce for a long time.
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Origin of carb

1
By shortening of carbohydrate

Definition for carb (2 of 3)

carb2
[ kahrb ]
/ kɑrb /

noun Informal.

a carburetor.

Origin of carb

2
First recorded in 1950–55; by shortening

Definition for carb (3 of 3)

carb-

variant of carbo- before a vowel: carbazole.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for carb

carb
/ (kɑːb) /

noun

short for carburettor
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

Medical definitions for carb

carb-

pref.

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