any of various rotary tools, with helical or straight flutes, for finishing or enlarging holes drilled in metal.
any bladelike pick or rod used for scraping, shaping, or enlarging a hole: a pipe reamer.
a kitchen utensil for extracting and collecting juice from fruits, having a deep saucerlike base and in the center a grooved cone on which the fruit half is pressed down by hand.
Dentistry. a drill with a spiral blade, for enlarging root canals.

1815–25; ream2 + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reamer (ˈriːmə)
1.  a steel tool with a cylindrical or tapered shank around which longitudinal teeth are ground, used for smoothing the bores of holes accurately to size
2.  (US) a utensil with a conical projection used for extracting juice from citrus fruits; lemon squeezer

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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American Heritage
Medical Dictionary

reamer ream·er (rē'mər)
A rotating tool used to shape or enlarge holes.

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 for +reamer
A straight reamer is used to make only a minor enlargement to a hole.
It also allows the reamer to start straight and reduce the risk of breakage.
Spiral flutes are essential on a machine reamer to clear the swarf automatically.
Combination reamer a combination reamer has two or more cutting surfaces.
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