semilunar

also sem·i·lu·nate (-lū'nāt')
adj.
Shaped like a half-moon; crescent-shaped.

(sĕm'ē-lū'nər, sĕm'ī-) or sem·i·lu·nate (-lū'nāt')
adj.

Shaped like a half-moon; crescent-shaped; lunar.

Shaped like a half-moon or crescent.

• s. valve — valve guarding the entrances into the aorta and pulmonary trunk from the cardiac ventricles.
• s. valve anomaly — abnormal development causes an irregular central perforation of the valve and the signs of valvular stenosis.

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The adjective has one meaning:

Meaning #1: resembling the new moon in shape
  Synonyms: bicephalous, crescent, crescent-shaped, lunate

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