(aviation) The primary landing gear of an aircraft, generally located slightly behind the aircraft's center of mass (or slightly ahead of it on a taildragger aircraft) and carrying the majority of the aircraft's weight.

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

(aviation) Synonym of bicycle landing gear

(aviation) A form of landing gear having the main gear and nosegear located fore and aft of the center of gravity under the fuselage with outriggers on the wings.

The gear in a worm drive.

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

plural of gear knob

plural of gear-wheel

Synonym of gear wheel

Alternative spelling of gear wheel