| ambivalent | (adjective) uncertain or unable to decide about what course to follow | - |
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| ambiversive | (adjective) intermediate between introversive and extroversive | - |
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| bivalent | (adjective) used of homologous chromosomes associated in pairs in synapsis | Synonyms: double |
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| (adjective) having a valence of two or having two valences | Synonyms: divalent |
| bivalve | (adjective) used of mollusks having two shells (as clams etc.) | Synonyms: bivalved |
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| bivalved | (adjective) used of mollusks having two shells (as clams etc.) | Synonyms: bivalve |
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| bivariate | (adjective) having two variables | - |
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| herbivorous | (adjective) feeding only on plants | - |
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