an electric railway operating below the surface of the ground (usually in a city); "in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'"
a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan
heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings
a steady flow (usually from natural causes); "the raft floated downstream on the current"; "he felt a stream of air"
a flow of electricity through a conductor; "the current was measured in amperes"
occurring in or belonging to the present time; "current events"; "the current topic"; "current negotiations"; "current psychoanalytic theories"; "the ship's current position"
a passage for water (or other fluids) to flow through; "the fields were crossed with irrigation channels"; "gutters carried off the rainwater into a series of channels under the street"
a television station and its programs; "a satellite TV channel"; "surfing through the channels"; "they offer more than one hundred channels"
a path over which electrical signals can pass; "a channel is typically what you rent from a telephone company"
(often plural) a means of communication or access; "it must go through official channels"; "lines of communication were set up between the two firms"
a deep and relatively narrow body of water (as in a river or a harbor or a strait linking two larger bodies) that allows the best passage for vessels; "the ship went aground in the channel"
direct the flow of; "channel information towards a broad audience"