| aurochs | (noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle | Synonyms: Bos primigenius, urus |
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| (noun) European bison having a smaller and higher head than the North American bison | Synonyms: Bison bonasus, wisent |
| neurochemical | (noun) any organic substance that occurs in neural activity | - |
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| pleurocarp | (noun) a moss having the archegonium or antheridium on a short side branch rather than the main stalk | Synonyms: pleurocarpous moss |
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| pleurocarpous | (adjective) (of mosses) having the archegonia on short lateral branches | - |
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| urocele | (noun) extravasation of urine into the scrotal sac | - |
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| urochesia | (noun) passage of urine from the anus | Synonyms: urochezia |
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| urochezia | (noun) passage of urine from the anus | Synonyms: urochesia |
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| urochord | (noun) a notochord of a larval tunicate typically confined to the caudal region | - |
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| (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: tunicate, urochordate |
| urochordate | (noun) primitive marine animal having a saclike unsegmented body and a urochord that is conspicuous in the larva | Synonyms: tunicate, urochord |
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