• (a.) Serving of tending to evacuate; cathartic; purgative.
E·vac'u·a·tive adjective [ Confer French évacuatif .] Serving of tending to evacuate; cathartic; purgative. 
evacuative 1. That which evacuates or the condition of being evacuated; discharge or expulsion, as of contents. 2. That which discharges, as of waste matter through the excretory passages; especially, from the bowels. 3. The removal of people or things from an endangered area.