gearbox gear • geared · · · Info · Definitions · Synonyms · Characters · · gearbox · · Text Latin · · Script 7 · · Length Definitions · · · (noun) the shell (metal casing) in which a train of gears is sealed. Synonyms: gear box, gear case. · · Noun Definition 1 Synonyms · · · gear box · · Synonym 1 gear case · · Synonym 2 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 e latin small letter e U+0065 g latin small letter g U+0067 o latin small letter o U+006F r latin small letter r U+0072 x latin small letter x U+0078