loud ‧ speak ‧ er /ˌlaʊdˈspiːkə, ˈlaʊdˌspiːkə $ -ər/ BrE AmE noun [countable]
1 .
a piece of equipment used to make sounds louder
from/over/through a loudspeaker
The voice over the loudspeaker (=using the loudspeaker) said the flight was delayed.
2 . a ↑ speaker (3)