By extension any small opening or interstice, especially one of many, or one allowing the passage of a fluid.
A tiny opening in the skin.
to study meticulously; to go over again and again.
to meditate or reflect in a steady way.
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.
One of the tiny pores in the epidermis of a leaf or stem through which gases and water vapor pass.
A mouthlike opening, such as the oral cavity of a nematode.
An artificial anus.