stoma /stō″mə/ pl. stomas, stomata [Gk, mouth] , 1. a pore, orifice, or opening on a surface. 2. an artificial opening of an internal organ on the surface of the body created surgically, such as for a colostomy, ileostomy, or tracheostomy. 3. a new opening created surgically between two body structures, such as for a gastroenterostomy, pancreaticogastrostomy, pancreatoduodenostomy, or pyeloureterostomy.
