| binocular | (adjective) relating to both eyes | - |
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| binoculars | (noun) (plural) an optical instrument designed for simultaneous use by both eyes | Synonyms: field glasses, opera glasses |
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| binomial | (adjective) of or relating to or consisting of two terms | - |
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| (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binominal |
| (noun) (mathematics) a quantity expressed as a sum or difference of two terms; a polynomial with two terms | - |
| binominal | (adjective) having or characterized by two names, especially those of genus and species in taxonomies | Synonyms: binomial |
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