A person who hunts herons or engages in heron hunting.
Formed from 'heron' (the bird, from Old French hairon) plus the agent suffix '-er' (indicating one who does an action), following the standard English pattern of occupational names.
Medieval heronry was a privileged pursuit reserved for nobility, so a 'heroner' wouldn't have been a common peasant but rather a specialist trained in falconry or hunting for royal courts—it was a status symbol.
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