avalvular

As a noun terms

is .

As an adjective avalvular is

having no valves.

As adjectives the difference between avalvular and valvular

is that avalvular is having no valves while valvular is (medicine|biology) of or pertaining to valves, such as those of the heart.

As a noun valve

is a device that controls the flow of a gas or fluid through a pipe.

As a verb valve

is to control (flow) by means of a valve.

As an adjective avalvular is

having no valves.