A person who greets, acclaims, or hails someone or something, or a device used to broadcast messages to a distance.
From hail (verb) + -er (agent suffix). Hailer derives from the Old Norse heilsa and Old English hælse, originally meaning 'to wish health or good fortune' and later 'to greet or acclaim.'
Before megaphones and PA systems, a hailer was simply someone with a loud voice or a speaking trumpet—the original human amplifier who could rally crowds or call ships across the harbor.
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