siphon

(noun) a tube running from the liquid in a vessel to a lower level outside the vessel so that atmospheric pressure forces the liquid through the tube. Synonyms: syphon.

(noun) a tubular organ in an aquatic animal (especially in mollusks) through which water can be taken in or expelled. Synonyms: syphon.

(verb) convey, draw off, or empty by or as if by a siphon. Synonyms: syphon, siphon off.

(verb) move a liquid from one container into another by means of a siphon or a siphoning action. Example: "Siphon gas into the tank."