Home›Browse›A›abdominal muscleabdominal muscleOur editors are putting together more complete content — check back in about 20 minutesabdominal muscleabdominal muscle — nounnoun1. One of the muscles in the front of the abdomen, used for bending and twisting th1.nounDefinitionOne of the muscles in the front of the abdomen, used for bending and twisting the trunk.ExampleHe does crunches every morning to strengthen his abdominal muscles.