What is the action of removing a substance by suction called?

The action of removing a substance by suction is termed "aspirate." This process typically involves using a device or instrument designed to create negative pressure, allowing the substance, which can be fluid or semi-solid, to be drawn out of a body cavity or access point. Aspirating is often used in medical contexts to remove excess fluid, cellular material, or other substances, ensuring that areas such as wounds or cavities remain clear of debris or infection. This technique is essential in various medical procedures, including surgeries or diagnostics where fluid samples are needed for analysis.

Other terms in the options refer to different actions. For instance, "incise" means to cut into tissue with a surgical instrument, while "extract" generally refers to the removal of a tooth or other objects from a specific location, and "drain" relates to removing fluids via gravity or a built-in system rather than suction. Hence, in the context of suction specifically, aspirating is the accurate term to describe this action.