machine screw

machine screw

noun
a threaded fastener, either used with a nut or driven into a tapped hole, usually having a diameter of about 1/4 in. (6.4 mm) or less and a slotted head for tightening by a screwdriver.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Machine screw is always a great word to know.
So is bezoar. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
machine screw
 
n
a fastening screw with a machine-cut thread throughout the length of its shank

Collins English Dictionary - Complete & Unabridged 10th Edition
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