MATRE 1 . Woman who has given birth, in relation to her children 2 . Female animals in similar condition 3 . Secluded place, mountains: In Argentina, Uruguay and Bolivia, a matrero is a person or animal that moves away to flee or isolate itself. 4 Mattress: in German mattress is Matratze, from the Dutch Matras. In English it is called mattress, so that it can be, with great probability, part of the 'Spanglish'.