Abdominal a. : Of or pertaining to the abdomen; ventral; as, the abdominal regions, muscles, cavity.

Abdominal a. : Having abdominal fins; belonging to the Abdominales; as, abdominal fishes.

Abdominal n. : A fish of the group Abdominales.

Example:
How can I work on my Abdominal area without loosing keeping my hips and buttocks?

Taxonomy
abdomen, human abdomen, muscle, organs, linea alba, ribs, spine, abdominal wall, crest of the ilium, vertical lines, cartilages, abdominal organs, free encyclopedia, fascia, thorax, kidneys, lower abdomen, pelvis.

Defination from the web:
abdominal cavity. ... Hollow abdominal organs include the stomach, the small intestine, and the colon with its attached appendix. ...