leaflet

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leaf·let

(lēf'let),
1. A layer of phospholipid; thus, a lipid bilayer has two leaflets.
2. A thin, flattened object or structure.

leaflet

The part of a valve designed to open in the direction of flow and close to prevent backflow. Its base is typically attached to a larger structure by a fixed stalk and its unattached end moves.

leaflet

Any small, leaf-like structure such as the cusps of a heart or other valve.