con·quis·ta·dor 
(kŏng-kēstə-dôr′, kŏn-kwĭstə-)
(kŏng-kēstə-dôr′, kŏn-kwĭstə-)n. pl. con·quis·ta·dors or con·quis·ta·dor·es (-dôr′ās, -ēz)
A conqueror, especially one of the 16th-century Spanish soldiers who defeated the Indian civilizations of Mexico, Central America, or Peru.
[Spanish, from conquistar, to conquer, from Vulgar Latin *conquīsītāre, frequentative of Latin conquīrere, to procure; see CONQUER.]