noun Date: 1894 a combination of gears used to reduce the input speed (as of a marine turbine) to a lower output speed (as of a ship's propeller)
REDUCTION GEAR
Meaning of REDUCTION GEAR in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012