- pinnacleThe highest point.
- pinnaThe visible part of the ear in most therians that resides outside of the head, the auricle; outer ear excluding the ear canal.
- pinnipedA marine mammal belonging to the parvorder Pinnipedia, comprising walruses, eared seals and earless seals, characterized by four limbs modified into flippers.
- pinniformShaped like a fin or feather.