bra·ce·ro 
(br
ə-sâr
ō)
n. pl. bra·ce·ros Any of the Mexican laborers in the mid-1900s who were permitted to enter the United States and work for a limited period of time, especially in agriculture.
[Spanish, laborer, from brazo, arm, from Latin brācchium, from Greek brakhīōn, upper arm; see mregh-u- in the Appendix of Indo-European roots.]