A small spring, pool, or other spot where liquid from the ground (e.g. water, petroleum or tar) has oozed to the surface; a place of seeping. Moisture, liquid, gas, etc. that seeps out; a seepage. The seeping away of a liquid, etc. A seafloor vent.

To ooze or pass slowly through pores or other small openings, and in overly small quantities; said of liquids, etc. To enter or penetrate slowly; to spread or diffuse. To diminish or wane away slowly.

Leak