alguacilPronunciation: /ˌalgwaˈθiːl, ˌalɣwaˈθil, -ˈsil/Definition of alguacil noun (plural alguaciles /ˌalgwaˈθiːlɪz, ˌalɣwaˈθiles, -ˈsiles/) each of a pair of mounted constables acting as an official at a bullfight. Origin:Spanish, from Arabic al-wazīr 'the helper, aide, or vizier'