| alyssum | (noun) any garden plant of the genus Alyssum having clusters of small yellow or white flowers | Synonyms: madwort |
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| odontoglossum | (noun) any of numerous and diverse orchids of the genus Odontoglossum having racemes of few to many showy usually large flowers in many colors | - |
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| opossum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: possum |
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| (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: phalanger, possum |
| possum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: opossum |
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| (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: opossum, phalanger |
| sargassum | (noun) brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea | Synonyms: gulfweed, sargasso, Sargassum bacciferum |
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