The Austronesian Comparative Dictionary

*samak a tree and the tannin that it yields: probably Macaranga tanarius

PWMP samak a tree and the tannin that it yields: probably Macaranga tanarius

WMP
Isneg támaɁ Macaranga tanarius L., a small dioedious, euphorbiaceous tree; its bark is used for (ingredients in sugarcane rum), and give the rum its brown color and its bitter taste
Ilokano sámak Macaranga tanarius, tree whose bark and bitter leaves are used to brew (sugarcane wine) and give it a brown color
Iban samak tanning, plants yielding tannin, preservative for cordage, nets, etc.
ñamak to steep or dye cordage, as a casting net
Malay samak tanning; material for tanning and prerserving leather, cordage, nets, etc.; tanning material is often bark from certain trees, mostly Eugenias, but mangrove bark is also used; one passage speaks of a wounded man’s clothes being stained with blood “as though tanned”
kulit samak dressed hide