/lowd"spee'keuhr/ , n.
1. any of various devices, usually electronic, by which speech, music, etc., can be intensified and made audible throughout a room, hall, or the like.
2. Audio.
a. a device for transforming electric signals into audible sound, most frequently used to reproduce speech and music.
b. speaker (def. 4).
[ 1880-85; LOUD + SPEAKER ]