Definition of "abdominal"

Of or pertaining to the abdomen; ventral.  examples

(ichthyology) Having the ventral fins under the abdomen and behind the pectoral fins.

(ichthyology) Ventral, in describing a fin.

(zoology, obsolete) Belonging to the order Abdominales of fish.

(zoology, obsolete) A fish of the order Abdominales.

(colloquial, usually plural only) An abdominal muscle.  examples