thorn a n 1 (=prickle) espina f IDIOMS to be a thorn in sb's side or flesh ser una espina para algn 2 (=bush, tree) espino m b cpd ♦ thorn bush, thorn tree n espino m
do they speak portugese? if so its Espinho if not you will find it here : http://translation.babylon.com/english/to-portuguese/thorn/
They speak Spanish, some portuguise over the brazil boarder but their first language is spanish (with it's own variation of course)
