Real Dictionary

pipe
countable noun: A pipe is a long, round, hollow object, usually made of metal or plastic, through which a liquid or gas can flow.

pipe in American English
a hollow cylinder or cone, as of reed, straw, wood, or metal, in which air vibrates to produce a musical sound, as in an organ or wind instrument
to play (a tune, etc.) on a pipe
to play on a pipe

pipe in American English 1
intransitive verb: to play on a pipe
noun: a hollow cylinder of metal, wood, or other material, used for the conveyance of water, gas, steam, petroleum, etc
transitive verb: to convey by or as by pipes

pipe in American English 2
noun: a large cask, of varying capacity, esp. for wine or oil

pipe in British English 1
noun: a long tube of metal, plastic, etc, used to convey water, oil, gas, etc

pipe in British English 2
noun: a large cask for wine, oil, etc