IL'IAC, adjective [Latin iliacus, from ilia, the flank, or small intestines; Gr. to wind.] Pertaining to the lower bowels, or to the ileum. The iliac passion, is a violent and dangerous kind of colic, with an inversion of the peristaltic motion of the bowels.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI