Bible Dictionary · C
Caul
(Heb. yothe’reth; i.e., “something redundant”), the membrane which covers the upper part of the liver (Ex 29:13, Ex 29:22; Lev 3:4, Lev 3:10, Lev 3:15; Lev 4:9; Lev 7:4; marg., “midriff”). In Hos 13:8 (Heb. seghor; i.e., “an enclosure”) the pericardium, or parts about the heart, is meant.
From Easton’s Bible Dictionary (1897), by Matthew George Easton.