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

• Oriya
• orle
• Orleanism
• Orleanist
• orleans
• orleanses
• orles
• orlistat
• orlistats
• Orlon
• orlop
• orlop deck
• orlop decks
• orlops
• Ormazd
• ormer
• ormers
• ormolu
• ormolus
• Ormuzd
• ornament
• ornamental
• ornamentalism
• ornamentalist
• ornamentalists