screw cap

noun
a cap designed to screw onto the threaded mouth of a bottle, jar, or the like.

Origin:
1870–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
screw cap
 
n
a.  a cap that screws on to a thread around the opening of a jar, bottle, etc to form a seal
 b.  (as modifier): screw-cap wines

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Collect oil in a clean container with screw cap, such as the original container
  or clean, labeled plastic jug.
Enclose the specimen in a screw cap tube or vial with a tight-fitting cap.
Open the inner container, remove the specimen bottle, and remove the screw cap.
Carefully transfer the filter and backup pad to a screw cap vial by means of
  tweezers.
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