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
the musical interval between one note and another three notes away from it; "a simple harmony written in major thirds"
following the second position in an ordering or series; "a distant third"; "he answered the first question willingly, the second reluctantly, and the third with resentment"
coming next after the second and just before the fourth in position
in the third place; "third we must consider unemployment"