of, in, on, or for the abdomen: abdominal wall; abdominal pains.
Usually abdominals. Informal. the abdominal muscles.
Origin of abdominal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
short for "abdominal muscles," attested by 1980; see abdominal.
1550s, from medical Latin abdominalis, from abdomen (genitive abdominis); see abdomen.
Online Etymology Dictionary, © 2010 Douglas Harper