n.[C]

1. 传送者；传递者；传输者；传播者
   Monkeys are transmitters of a number of dangerous diseases.

   猴子是许多危险疾病的传染媒介。

2. （电话的）送话器，话筒
3. 发报机；发射机；发射台

n.

1. a device or installation used to generate and transmit electromagnetic waves carrying messages or signals, especially those of radio or television.
2. short for neurotransmitter.