(Science: zoology) The half-wild horse of the plains in Mexico, California, etc. It is small, hardy, and easily sustained.
(Science: botany) mustard grape, a species of grape (vitis candicans), native in Arkansas and Texas. The berries are small, light-coloured, with an acid skin and a sweet pulp.
Origin: sp. Musteno belonging to the graziers, strayed, wild.
mustang (noun): an un-owned, wild and free roaming feral horse habited on the western rangelands of the united states.