n.
Variant: also buck · er · oo
Pronunciation: ˌ b ə -k ə - ' rü, ' b ə -k ə - ˌ
Function: noun
Inflected Form: plural -aroos also -eroos
Etymology: probably by folk etymology from Spanish vaquero, from vaca cow, from Latin vacca ― more at VACCINE
Date: 1827
1 : COWBOY
2 : BRONCOBUSTER