adjective
Of or pertaining to the abdomen; ventral.
(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.
noun
(zoology, obsolete) A fish of the order Abdominales.
(colloquial) An abdominal muscle.