matamata

1 :  a pleurodiran turtle (Chelus fimbriata) of Guiana and the northern part of Brazil that reaches a length of three feet, has a rough shell and a long neck with fleshy fimbriae on the neck and on the head, and produces eggs that yield an edible oil

2 :  any of several South American trees of the genus Eschweilera of the family Lecythidaceae; especially :  a tree yielding a heavy hard compact wood used for pilings and foundation construction