Etymology
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shillelagh (n.)

"cudgel," 1772, earlier, "oak wood used to make cudgels" (1670s), from Shillelagh, town and barony, famous for its oaks, in County Wicklow, Ireland. The name is literally "seeds (or descendants) of Elach, from Irish siol "seed."

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Definitions of shillelagh

shillelagh (n.)
a cudgel made of hardwood (usually oak or blackthorn);
Synonyms: shillalah
From wordnet.princeton.edu