noun / adjective
coagulant
koh-AG-yuh-lunt/koʊˈæɡjələnt/
A substance that causes a liquid to clot or solidify, or having this effect.
The coagulant gathers suspended particles into clumps in the cloudy water.

Etymology
The curdling verb appears here in a participial form meaning 'causing to curdle.' That active sense names a substance by what it does: making a liquid thicken or form clots.
In context
as I slowly stir in each coagulant the temperature will fall as I see some curds already forming I can stop stirring
More examples
- The wound dressing contains a coagulant to help blood clot.
- The enzyme has a coagulant effect on milk.
- Different coagulants produce tofu with different textures.
Forms
coagulant · coagulants
coagulate verb — To clot or cause a liquid to clot.
coagulation noun — The process of clotting or solidifying.
Similar words
- hemostatic
- Stops bleeding, sometimes by methods other than causing clotting.
- curdling
- Specifically describes causing milk or another liquid to form curds.