SHILLELAGH Meaning of SHILLELAGH in English [ ʃɪ'leɪlə , -li ]■ noun (In Ireland) a cudgel of blackthorn or oak.OriginC18: from the name of the town Shillelagh , in Co. Wicklow, Ireland. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004