| basil | (noun) leaves of the common basil; used fresh or dried | Synonyms: sweet basil |
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| (noun) any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum | - |
| basileus | (noun) a ruler of the eastern Roman Empire | - |
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| basilica | (noun) a Roman building used for public administration | Synonyms: Roman basilica |
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| (noun) an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges | - |
| basilisk | (noun) small crested arboreal lizard able to run on its hind legs; of tropical America | - |
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| (noun) ancient brass cannon | - |
| (noun) (classical mythology) a serpent (or lizard or dragon) able to kill with its breath or glance | - |