A metal screen with holes large enough for worker honeybees to pass through but too small to allow the passage of the queen, used to exclude the queen from certain sections of the hive.
Origin
Late 19th century.
Definition of queen excluder in US English:
queen excluder
noun
Bee-keeping
A metal screen with holes large enough for worker honeybees to pass through but too small to allow the passage of the queen, used to exclude the queen from certain sections of the hive.