[{"Bold_text": "noun", "List Items": ["a person or thing that transmits .", "Also calledtransmit?ting set?.Radio.a device for sending electromagnetic waves; the part of a broadcasting apparatus that generates and modulates the radiofrequency current and conveys it to the antenna.", "the part of a telephonic or telegraphic apparatus that converts sound waves or mechanical movements into corresponding electric waves or impulses.", "Biochemistry. neurotransmitter ."]}]