orillero, -a, a. and s., Arg., pertaining to the suburbs of a city; suburban dweller
Orinoco, river in northern South America
orla, fringe, hem, border
oro, gold;
—— de buena ley, genuine gold, warranted gold, gold of standard weight
osadía, boldness
osado, -a, daring
osamenta, bones, skeleton
osar, to dare
oscilación, oscillation
oscurecer, to darken