stomas

noun

1. 1

   One of the tiny pores in the epidermis of a leaf or stem through which gases and water vapor pass.

2. 2

   A small opening in a membrane; a surgically constructed opening, especially one in the abdominal wall that permits the passage of waste after a colostomy or ileostomy.

3. 3

   A mouthlike opening, such as the oral cavity of a nematode.

4. 4

   An artificial anus.