fog·horn 
/ˈfɑ:gˌhoɚn/ noun
plural fog·horns /ˈfɑ:gˌhoɚn/ noun [count] : a horn on a boat, ship, etc., that makes a loud, deep sound and is used in foggy weather to warn nearby ships — often used figuratively to describe someone with a very loud voice ▪ He has a foghorn voice. [=a voice like a foghorn]
