English pronunciation: TEE-shok (Show more) taoiseach, head of government of Ireland. The office of taoiseach (prime minister) was created by the Irish constitution of December 29, 1937. Executive power in the Irish government is vested in the taoiseach, who heads the cabinet and presides over its meetings. The taoiseach must be a member of the Dáil Éireann (House of Representatives), the lower house of the Oireachtas (Parliament). ...(100 of 62 words) Access the full article Help support true facts by becoming a member. Subscribe today!