Search Result for "rictus": 
Wordnet 3.0

NOUN (1)

1. a gaping grimace;

The Collaborative International Dictionary of English v.0.48:

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. [1913 Webster]
WordNet (r) 3.0 (2006):

rictus n 1: a gaping grimace
Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "rictus": bob, bobble, bounce, bump, didder, dither, falter, grimace, jar, jerk, jig, jigget, jiggle, jog, joggle, jolt, jostle, moue, mow, pout, quake, quaver, quiver, shake, shiver, shock, shudder, snarl, tic, tremble, tremor, twitch, twitter, wobble, wry face, wry mouth