screwdriver

[skroo-drahy-ver]
noun
1.
a hand tool for turning a screw, consisting of a handle attached to a long, narrow shank, usually of metal, which tapers and flattens out to a tip that fits into the slotted head of a screw.
2.
a mixed drink made with vodka and orange juice.

Origin:
1770–80; screw + driver

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
screwdriver (ˈskruːˌdraɪvə)
 
n
1.  a tool used for turning screws, usually having a handle of wood, plastic, etc, and a steel shank with a flattened square-cut tip that fits into a slot in the head of the screw
2.  an alcoholic beverage consisting of orange juice and vodka

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

screwdriver
"tool for driving screws," 1779, from screw (n.) + driver. Meaning "cocktail made from vodka and orange juice" is recorded from 1956. (Screwed/screwy had a sense of "drunk" since 19c.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica
Encyclopedia

screwdriver

tool, usually hand-operated, for turning screws with slotted heads. For screws with one straight diametral slot cut across the head, standard screwdrivers with flat blade tips and in a variety of sizes are used. Special screws with cross-shaped slots in their heads require a special screwdriver with a blade tip that fits the slots. The most common special screw is the Phillips head (Phillips Screw) as shown in the

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Find a solid flat-head screwdriver, and work your way up.
Push against the wall as you screw in the eyehooks, first by hand and then
  using a screwdriver for more leverage.
If you can't push a screwdriver up to its handle into the turf, it's time to
  aerate.
Gently poke any discolored areas with a screwdriver to make sure the wood is
  solid and not rotting or waterlogged.
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