noun, plural rictus, rictuses.
the gape of the mouth of a bird.
the gaping or opening of the mouth.

1750–60; < Latin: wide-open mouth, equivalent to rig-, variant stem of ringī to open the mouth wide + -tus suffix of v. action.

rictal, adjective
subrictal, adjective
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World English Dictionary
rictus (ˈrɪktəs)
n , pl -tus, -tuses
1.  the gap or cleft of an open mouth or beak
2.  a fixed or unnatural grin or grimace, as in horror or death
[C18: from Latin, from ringī to gape]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It's a stiff rictus of hatred, and pointy-headed at that.
At the meeting the editor tried to be affable and he even gave us his rictus of a smile.
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