RICTUS Meaning of RICTUS in English [ric.tus] n [NL, fr. L, open mouth, fr. ringi to open the mouth; akin to OCS rogu mockery] (1827) 1: the gape of a bird's mouth 2. a: the mouth orifice b: a gaping grin or grimace Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012