differential gear
— Noun
– English
～ a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves
double-geared
— Adjective
– English
～ (of a lathe) equipped with gearing for reducing the speed of the spindle from that of the driving pulley; "a back-geared lathe"
double-geared
— Adjective
– English
～ equipped with compound gearing consisting of 2 pinions and 2 wheels in mesh to increase the mechanical advantage; "the double-geared lifting mechanism of a crane"
dominant gene
— Noun
– English
～ gene that produces the same phenotype in the organism whether or not its allele identical; "the dominant gene for brown eyes"