1. a unit of gravitational acceleration equal to one thousandth of a gal
Usage: physics; geology

Examples

• The gravity survey measured variations of several milligals across the region.
• Scientists use milligals to detect underground oil deposits.
• The gravitometer can measure differences as small as 0.01 milligals.
• Gravity anomalies were recorded in milligals on the geological map.
• The instrument detected a 15-milligal increase near the dense rock formation.