A part of the amnion, one of the membranes enveloping the fetus, which sometimes is round the head of a child at its birth; -- called also a veil
. [1913 Webster
"It is deemed lucky to be with a caul or membrane over the face. This caul is esteemed an infallible preservative against drowning . . . According to Chrysostom, the midwives frequently sold it for magic uses."
"I was born with a caul, which was advertised for sale, in the newspapers, at the low price of fifteen guineas."