| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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| autacoidal | (adjective) of or relating to an autacoid | - |
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| catacomb | (noun) an underground tunnel with recesses where bodies were buried (as in ancient Rome) | - |
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| catacorner | (adjective) slanted across a polygon on a diagonal line | Synonyms: cata-cornered, cater-cornered, catercorner, catty-corner, catty-cornered, kitty-corner, kitty-cornered |
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| psittacosaur | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaurus |
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| psittacosaurus | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaur |
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| psittacosis | (noun) infectious disease of birds | Synonyms: parrot disease |
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| (noun) an atypical pneumonia caused by a rickettsia microorganism and transmitted to humans from infected birds | Synonyms: ornithosis, parrot fever |
| taco | (noun) a tortilla rolled cupped around a filling | - |
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| (noun) (ethnic slur) offensive term for a person of Mexican descent | Synonyms: greaser, wetback |
| taconite | (noun) a variety of chert containing magnetite and hematite; mined as a low-grade iron ore | - |
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