stoma

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

A small aperture in the surface of a membrane.

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

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

In zoology, a mouth or ingestive opening; an oral orifice; an ostium or ostiole: chiefly used of small or simple apertures, as a cytostome; hence, also, a small opening of any kind through which something may pass in or out; a pore.

In botany, a minute orifice or slit in the epidermis of leaves, etc., which opens directly into air-cavities or intercellular spaces that pervade the interior, and through which free ingress and egress of air take place; a breathing-pore.

In Sweden borg’s philosophy, a cubical figure with hollowed surfaces, being the figure of the interstices of spheres arranged in what Swedenborg calls the fixed quadrilateral pyramidal position, supposed to be that natural to the spherical particles of water.

One of the minute apertures between the cells in many serous membranes.

The minute breathing pores of leaves or other organs opening into the intercellular spaces, and usually bordered by two contractile cells.