1. comparative form of fat; having more body weight or flesh than another person or thing
2. comparative form of fat; containing more fat or being thicker than another thing

Examples

• The turkey looked fatter this year than last Thanksgiving.
• My wallet is fatter after getting paid.
• The fatter book contains more information.
• She chose the fatter slice of cake.
• The fatter tire provides better traction.
• His face looked fatter in the old photograph.