| biparous | (adjective) producing two offspring at a time | Synonyms: twinning |
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| bipartisan | (adjective) supported by both sides | Synonyms: bipartizan, two-party, two-way |
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| bipartite | (adjective) divided into two portions almost to the base | - |
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| (adjective) involving two parts or elements | Synonyms: two-part, two-way |
| bipartizan | (adjective) supported by both sides | Synonyms: bipartisan, two-party, two-way |
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| biped | (adjective) having two feet | Synonyms: bipedal, two-footed |
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| bipedal | (adjective) having two feet | Synonyms: biped, two-footed |
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| bipinnate | (adjective) of a leaf shape; having doubly pinnate leaflets (as ferns) | - |
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| bipinnatifid | (adjective) pinnatifid with the segments also pinnatifid | - |
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| bipolar | (adjective) having two poles | - |
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| (adjective) of, pertaining to, or occurring in both polar regions | - |
| (adjective) of or relating to manic depressive illness | - |