| reptilian | (adjective) of or relating to the class Reptilia | - |
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| streptococcal | (adjective) of or relating to or caused by streptococci | Synonyms: strep, streptococcic |
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| streptococcic | (adjective) of or relating to or caused by streptococci | Synonyms: strep, streptococcal |
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| surreptitious | (adjective) marked by quiet and caution and secrecy; taking pains to avoid being observed | Synonyms: furtive, sneak, sneaky, stealthy |
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| (adjective) conducted with or marked by hidden aims or methods | Synonyms: clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, undercover, underground |