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

• unexemplified
• unexercised
• unexhausted
• unexpanded
• unexpectant
• unexpected
• unexpectedly
• unexpectedness
• unexpectednesses
• unexpensive
• unexpensively
• unexperienced
• unexperient
• unexpiated
• unexpired
• unexplainable
• unexplained
• unexploded
• unexploited
• unexplored
• unexposed
• unexpressed
• unexpressible
• unexpressive
• unexpugnable