REGICIDE Meaning of REGICIDE in English [ 'rɛdʒɪsʌɪd ]■ noun the killing of a king. ↘a person who does this.Derivativesregicidal adjective OriginC16: from L. rex , reg- 'king' + -cide . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004