资料来源 : pyDict

嘴裂

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Rictus \Ric"tus\, n. [L., the aperture of the mouth.]
   The gape of the mouth, as of birds; -- often resricted to the
   corners of the mouth.

资料来源 : WordNet®

rictus
     n : a gaping grimace