Definitions for "Ground clearance"
Space between the ground and a given mechanical part of the vehicle. Usually, when quoted for a vehicle, taken as the least for any component on the vehicle - the space under the differential casing. But note difference between under-axle and underbelly clearance.
this is the amount of space between the lower most hanging part of your vehicle's undercarriage and the flat ground
Minimum distance between the ground and the lowest point of the under body.