Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. 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.

Etymologies

pinch +‎ cock (Wiktionary)

Examples

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