reamer

[ree-mer]
noun
1.
any of various rotary tools, with helical or straight flutes, for finishing or enlarging holes drilled in metal.
2.
any bladelike pick or rod used for scraping, shaping, or enlarging a hole: a pipe reamer.
3.
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.
4.
Dentistry. a drill with a spiral blade, for enlarging root canals.

Origin:
1815–25; ream2 + -er1

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Collins
World English Dictionary
reamer (ˈriːmə)
 
n
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
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American Heritage
Medical Dictionary

reamer ream·er (rē'mər)
n.
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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