The outer part of the ear in humans and other mammals, also known as the auricle. The pinna helps to collect sound waves and direct them into the ear canal.
A leaflet or primary division of a compound leaf or frond. Each pinna of the fern was delicately veined and vibrant green.
Any wing-, feather-, or fin-like projecting part of an animal or other organism. The mollusc’s shell bears a narrow pinna that helps to stabilize it in the water.