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| ric·tus [ ríktəss ] (plural ric·tus or ric·tus·es) |
noun |
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1. strange grin or grimace: a fixed open-mouthed grin or grimace, especially an expression of horror
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2. gape of bird's beak: the gape of a bird's beak
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| [Mid-18th century. < Latin< past participle of ringi "gape"] |
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 ric·tal adjective |
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