rictal

rictus

[rik-tuhs]
noun, plural rictus, rictuses.
1.
the gape of the mouth of a bird.
2.
the gaping or opening of the mouth.

Origin:
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]
 
'rictal
 
adj

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