styptic
That stops bleeding; especially, in a minor way, topically.
The growth on top was a scrubby plant, unknown anywhere else on Malta, which was believed to have styptic qualities – it could staunch bleeding when packed on top of a wound […].
Where it comes from
Learned borrowing from Latin stypticus, itself borrowed from Ancient Greek στυπτικός (stuptikós), from στύφω (stúphō, “to contract”).
Adapted from the Wiktionary entry styptic (CC BY-SA 4.0).