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| a semilunar valve between the pulmonary artery and the right ventricle of the heart that prevents the blood from flowing back into the right ventricle |
| a natural division or groove in an organ, as in the brain |
arborization ar·bo·ri·za·tion (är'bər-ĭ-zā'shən)
n.
The treelike terminal branching of nerve fibers or blood vessels.
The leaflike pattern formed under certain conditions by a dried smear of cervical mucus.