riktus

listen to the pronunciation of riktus
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(Tıp) rictus
Any open-mouthed expression

his face was a rictus of sheer delight.

A bird's gaping mouth
a gaping grimace
\RIK-tus\, noun: 1 The gape of the mouth, as of birds 2 A gaping grin or grimace
The gape of the mouth, as of birds; often resricted to the corners of the mouth
{i} width of the opening of the mouth of a bird; opening of the mouth; gaping grimace
Base of the bill where the mandibles join Synonym(s): gape, commissure In picture it is referred to as gape
A birds gaping mouth