something that removes an obstacle
• (n.) A medicine which removes obstructions; an aperient. • (a.) Removing obstructions; having power to clear or open the natural ducts of the fluids and secretions of the body; aperient.
Removes obstructions by opening natural passages or pores of the body.
De·ob'stru·ent adjective (Medicine) Removing obstructions; having power to clear or open the natural ducts of the fluids and secretions of the body; aperient. -- noun (Medicine) A medicine which removes obstructions; an aperient. 
An herb or substance that aids in the removal of obstructions, especially those lodged in organs such as stones. (Syn
Deobstruents are medicines which open the natural passages of the fluids of the body, as the pores and lacteal vessels, and thus cause removal of obstructions.