A person who catches or hunts gannets, or someone who works with these seabirds.
From gannet (a seabird) plus the agent suffix -er. Gannet comes from Old English gānot, of uncertain origin, possibly related to gander (male goose). The -er suffix marks someone who performs an action.
Gannets are remarkable dive-bombers that plunge from 100 feet up at speeds over 60 mph—their skulls have special shock-absorbing chambers. Medieval gannet hunters were so skilled they could identify breeding colonies by the birds' distinctive vocalizations from miles away.
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