A fixed grimace or grin.
Early 19th century: from Latin, literally ‘open mouth’, from rict- ‘gaped’, from the verb ringi.
“They stood, faces frozen in rictus through sheer terror.”
Something or someone that one vehemently dislikes/ A strong curse.
Early 16th century: from ecclesiastical Latin, ‘excommunicated person, excommunication’, from Greek anathema ‘thing dedicated’, (later) ‘thing devoted to evil, accursed thing’, from anatithenai ‘to set up’.