rictus /rikˈtəs/ (zoology)

1. The gape, esp of a bird
2. The chink or aperture of a lipped corolla
3. Unnatural gaping of the mouth, eg in horror

• peracute
• peradventure
• peradventures
• peraeon
• peraeopod
• perai
• perais
• perambulate
• perambulated
• perambulates
• perambulating
• perambulation
• perambulations
• perambulator
• perambulators
• perambulatory
• per an.
• per annum
• per ardua ad astra
• perborate
• perborates
• Perca
• percale
• percales
• percaline