hapax legomenon /hapˈaks le-gomˈə-non/ (Greek)

1. (literally) said once
2. A word or phrase that is found once only

• periphytons
• periplast
• periplasts
• periplus
• peripluses
• periproct
• periprocts
• peripteral
• peripteries
• periptery
• perique
• periques
• peris
• perisarc
• perisarcs
• periscian
• periscians
• periscope
• periscopes
• periscopic
• periselenia
• periselenium
• periseleniums
• perish
• perishabilities