Pinna can refer to:* Pinna (anatomy), the outer part of the ear - also referred to as the auricle Pinna (genus), a genus of bivalve molluscs also known as "pen shells" In botany the pinnae are the divisions of a compound frond, analogous to the leaflets of a compound leaf Giovanni Pinna, a paleontologist and describer of the Triassic reptile Drepanosaurus… (More on Pinna)