| biracial | (adjective) consisting of or combining two races | - |
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| biradial | (adjective) showing both bilateral and radial symmetry | - |
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| biramous | (adjective) resembling a fork; divided or separated into two branches | Synonyms: bifurcate, branched, forficate, fork-like, forked, pronged, prongy |
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| birch | (adjective) consisting of or made of wood of the birch tree | Synonyms: birchen, birken |
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| birchen | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birken |
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| birefringent | (adjective) relating to or characterized by double refraction | - |
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| birken | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birchen |
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