hailer

noun

USHAY-ler/ˈheɪlɚ/UKHAY-luh/ˈheɪlə/

1 meaning of hailer

1
nouncountable
A person or device that calls out loudly to get someone's attention or bring them over.
The captain grabbed a hailer to call the swimmers back to shore.
Without a hailer, the lifeguard had to shout across the whole beach.
Similarmegaphone, bullhorn, announcer, crier

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Origin

From the word "hail" plus "-er".