conduit vs petcock

conduit

noun
  • A pipe or channel for conveying water, etc. 

  • A duct or tube into which electrical cables may be pulled; a type of raceway. 

  • A means by which something is transmitted. 

  • An investment vehicle that issues short-term commercial paper to finance long-term off-balance sheet bank assets. 

petcock

noun
  • A small valve, spout, or faucet operated by hand, usually used to release pressure or drain fluid. 

How often have the words conduit and petcock occurred in a corpus of books? (source: Google Ngram Viewer )