Caul (Lat. caula, a fold), a membrane which sometimes envelopes the head of a child when born. It is of interest only for the superstitious feelings with which it has long been regarded. The child that happened to be born with it was esteemed particularly fortunate; and the possession of it afterward, however obtained, was highly prized, as of a charm of great virtue. The superstition is thought to have come from the East; and according to Weston, in his "Moral Aphorisms from the Arabic," there are several words in that language for it. With the French, etre ne coiffe was an ancient proverb, indicative of the good fortune of the individual. The alchemists ascribed magical virtues to it; and according to Grose, the health of the person born with it could in after life be judged of by its condition, whether dry and crisp, or relaxed and flaccid. Medicinal virtues are probably still imputed to it by the ignorant, as is the property of preserving the owner of it from drowning.