noun

1. a person who speaks; esp.,
   1. a person who makes a speech or speeches in public
   2. the officer presiding over any of various lawmaking bodies
   3. ☆ the presiding officer of the U.S. House of Representatives
      in full Speaker of the House
2. ☆ a book of selections for use as exercises in declamation
3. 1. a device consisting of a magnet and a diaphragm of paper, plastic, etc., for converting electrical signals to sound waves that are radiated into the air
   2. a boxlike enclosure holding one or more such devices