(aviation) Landing gear mounted in the lower part of an aircraft's fuselage, generally between or slightly behind the wings.

The gear in a worm drive.

plural of worm gear

(engineering) functional unit of an apparatus that breaks solid materials into smaller pieces

The central gear wheel of an epicyclic gear train; the central gear in planetary gear box, which spins the planet gears

(engineering) An epicyclic gear; the middle gears in a planetary gear system, spun by the central sun gear

plural of planet gear

plural of sun gear

Synonym of jacking gear

A device, placed on the shaft of an engine, or the rotor of a turbine, allowing it to be slowly turned manually