planet gear planetesimal hypothesis • plane ticket · · · Info · Definitions · Synonyms · Characters · · planet gear · · Text Common · · Latin · · Scripts 11 · · Length 3 · · Syllables Definitions · · · (noun) an outer gear that revolves about a central sun gear of an epicyclic train. Synonyms: planetary gear, epicyclic gear, planet wheel, planet gear. · · Noun Definition 1 Synonyms · · · planetary gear · · Synonym 1 epicyclic gear · · Synonym 2 planet wheel · · Synonym 3 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 l latin small letter l U+006C n latin small letter n U+006E p latin small letter p U+0070 r latin small letter r U+0072 t latin small letter t U+0074