Synonyms for Caul (same or very similar meaning)
WordNet sense 1 (part of the peritoneum attached to the stomach and to the colon and covering the intestines):
greater omentum, gastrocolic omentumWordNet sense 2 (the inner membrane of embryos in higher vertebrates (especially when covering the head at birth)):
veil, embryonic membraneFrom the ODE community, based on WordNetadd/edit