rictus

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rictus

(rĭk′təs)
n. pl. rictus or ric·tuses
1. A gaping grimace: "his mouth gaping in a kind of rictus of startled alarm" (Richard Adams).
2.
a. The expanse of an open mouth or a bird's beak.
b. The corner of the mouth or the fleshy area where the upper and lower mandibles of a bird meet.

ric′tal adj.

rictus

A facial contortion or grimace of pain.

rictus

the expanse of the open mouth, or gape, in an animal, or the throat of the calyx in a flower.