1 As time goes on, the child is less and less able to hold the stool in-more and more stool leaks, and eventually the child passes entire bowel movements into his or her underwear.  Often the child is not aware that he or she has passed a bowel movement.
n. 1. (Textiles). a. a cotton fabric treated with oil and pigment to make it waterproof. b. (as modifier): an oilskin hat. 2. (Clothing & Fashion) (often plural) a protective outer garment of this fabric.
Freebase (0.00 / 0 votes) Rate this definition: Onionskin. Onionskin or onion skin is a thin, light-weight, strong, often translucent paper. It was usually used with carbon paper for typing duplicates in a typewriter, for permanent records where low bulk was important, or for airmail correspondence.