1. The person who stands DSC on a podium
, in front of an orchestra
, waving a baton
, and beating his music stand
2. The person who punches tickets on a train, and says things like, "Next stop, River City, Ioway."
3. science. Antonym of insulator
, a material that allows for the transfer of energy. Due to their single free valence electron, gold, silver, and copper are good conductors.