sleeper cell sleeper • sleeper goby · · · Info · Definitions · Characters · · sleeper cell · · Text Common · · Latin · · Scripts 12 · · Length 3 · · Syllables Definitions · · · (noun) a cell of sleepers. Synonyms: sleeper cell. Example: "An al-qaeda sleeper cell may have used arizona as its base." · · Noun Definition 1 Characters · · space U+0020 c latin small letter c U+0063 e latin small letter e U+0065 l latin small letter l U+006C p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073