| archosaurian | (adjective) of or relating to reptiles of the subclass Archosauria | - |
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| (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
| auric | (adjective) of or relating to or containing or derived from gold | Synonyms: aurous |
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| auricle | (noun) a small conical pouch projecting from the upper anterior part of each atrium of the heart | Synonyms: atrial auricle, auricula atrii |
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| (noun) the externally visible cartilaginous structure of the external ear | Synonyms: ear, pinna |
| auricula | (noun) a pouch projecting from the top front of each atrium of the heart | Synonyms: auricular appendage, auricular appendix |
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| (noun) yellow-flowered primrose native to Alps; commonly cultivated | Synonyms: bear's ear, Primula auricula |
| auricular | (adjective) of or relating to near the ear | Synonyms: otic |
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| (adjective) pertaining to an auricle of the heart | - |
| (adjective) relating to or perceived by or shaped like the organ of hearing | - |
| auriculare | (noun) the craniometric point at the center of the opening of the external acoustic meatus | Synonyms: auricular point |
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| auriculate | (adjective) having auricles | Synonyms: auriculated |
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| auriculated | (adjective) having auricles | Synonyms: auriculate |
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| auriculoventricular | (adjective) relating to or affecting the atria and ventricles of the heart | Synonyms: atrioventricular |
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| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| auriform | (adjective) having a shape resembling an ear | Synonyms: ear-like, ear-shaped |
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| aurify | (verb) turn golden | - |
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| (verb) transform into gold | - |
| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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| biauricular | (adjective) relating to the two auditory openings | - |
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| kauri | (noun) tall timber tree of New Zealand having white straight-grained wood | Synonyms: Agathis australis, kaury |
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| (noun) white close-grained wood of a tree of the genus Agathis especially Agathis australis | - |
| (noun) resin of the kauri trees of New Zealand; found usually as a fossil; also collected for making varnishes and linoleum | Synonyms: kauri copal, kauri gum, kauri resin |
| saurian | (adjective) of or relating to lizards | Synonyms: lacertilian |
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| (noun) any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs | - |
| saurischian | (noun) herbivorous or carnivorous dinosaur having a three-pronged pelvis like that of a crocodile | Synonyms: saurischian dinosaur |
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| staurikosaur | (noun) primitive dinosaur found in Brazil | Synonyms: staurikosaurus |
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| staurikosaurus | (noun) primitive dinosaur found in Brazil | Synonyms: staurikosaur |
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| taurine | (adjective) of or relating to or resembling a bull | - |
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| (noun) a colorless crystalline substance obtained from the bile of mammals | - |
| titanosaurian | (noun) amphibious quadrupedal herbivorous dinosaur with a long thin neck and whiplike tail; of the Cretaceous mostly in the Southern Hemisphere | Synonyms: titanosaur |
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