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abdominal (adj.)

"pertaining to the abdomen, ventral," 1550s, from medical Latin abdominalis, from abdomen (genitive abdominis); see abdomen. As a noun, "abdominal muscle," by 1961 (earlier "abdominal vein," 1928);  earlier as a fish of the order including carp, salmon, and herring (1835), so called for their ventral fins. Related: Abdominally. English in 17c. had abdominous "big-bellied."

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Definitions of abdominal from WordNet
1
abdominal (n.)
the muscles of the abdomen;
Synonyms: abdominal muscle / ab
2
abdominal (adj.)
of or relating to or near the abdomen;
abdominal muscles
From wordnet.princeton.edu