A liquid or gas used as a medium for another substance.
A piece which communicates to an object in a lathe the motion of the faceplate; a lathe dog.
A movable piece in magazine guns which transfers the cartridge to a position from which it can be thrust into the barrel.
A person or other organism that has a genetic trait, mutation or infection liable to cause a disease, but displays no symptoms.
A catalyst or other intermediary in a chemical reaction.
A certified airline.
A charge carrier.
A mobile network operator; wireless carrier.
A signal such as radio, sound, or light that is modulated to transmit information.
A movable piece in a planetary gear train.
A person or company in the business of shipping freight.
A carrier pigeon.
A person or object that carries someone or something else.
A spool holder or bobbin holder in a braiding machine.
The transmission of heat in a fluid by the circulation of currents.
The vertical movement of heat and moisture, especially by updrafts and downdrafts in an unstable air mass. The terms convection and thunderstorm are often used interchangeably, although thunderstorms are only one form of convection. Towering cumulus clouds are visible forms of convection.