| Word | Definitions | Synonyms |
|---|---|---|
| opopanax | (noun) an odorous gum resin formerly used in medicines | - |
| opossum | (noun) nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America | Synonyms: possum |
| (noun) small furry Australian arboreal marsupials having long usually prehensile tails | Synonyms: phalanger, possum |