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

ricˈtal adjective

1. Of the gape
2. At the corners of the mouth

• vasculums
• vas deferens
• vase
• vasectomies
• vasectomy
• Vaseline
• Vaselined
• Vaselines
• vases
• vasiform
• vaso-
• vasoactive
• vasoconstriction
• vasoconstrictor
• vasoconstrictors
• vasoconstrictory
• vasodilatation
• vasodilatations
• vasodilatatory
• vasodilation
• vasodilations
• vasodilator
• vasodilators
• vasodilatory
• vasomotor