1. the external part of the ear; the visible flap of cartilage and skin that projects from the side of the head
Usage: anatomy
2. a leaflet or primary division of a pinnately compound leaf
Usage: botany

Examples

• The doctor examined the patient’s pinna for signs of infection.
• Sound waves are collected by the pinna and directed into the ear canal.
• The pinna helps us determine the direction of sounds.
• Each pinna of the fern leaf had a serrated edge.
• The botanist counted twelve pinnae on the compound leaf.
• Damage to the pinna can affect hearing ability.