Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A clamp used to regulate or close a flexible tube, especially in laboratory apparatus.

from The Century Dictionary.

  • noun A clamp for compressing a flexible pipe, either to regulate the flow of a liquid through it or to serve as a stopcock by holding the sides of the tube in contact.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A clamp on a flexible pipe to regulate the flow of a fluid through the pipe.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A clamp on a flexible pipe to regulate the flow of fluid.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pinch +‎ cock

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