Semilunar can refer to:
*
Semilunar valve
A heart valve is a biological one-way valve that allows blood to flow in one direction through the chambers of the heart. A mammalian heart usually has four valves. Together, the valves determine the direction of blood flow through the heart. Hear ...
s
*
Semilunar ganglion, or the trigeminal ganglion
* An older name for the
Lunate bone
The lunate bone (semilunar bone) is a carpal bone in the human hand. It is distinguished by its deep concavity and crescentic outline. It is situated in the center of the proximal row carpal bones, which lie between the ulna and radius and the h ...
* In neurology, the
semilunar fasciculus.
{{Disambig