oak apple

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oak apple

, gall
any of various brownish round galls on oak trees, containing the larva of certain wasps
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Part of the tradition was to wear a sprig of oak, if possible with oak apples attached, on that day.
The houses were decorated by oak branches; villagers wore sprigs of oak leaves (complete with oak apples) in their hats and there were oak boughs on the church tower.
The tradition of wearing oak leaves or oak apples began during the Restoration, when Charles was back on the throne.