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siphon (n.)

late 14c., from Latin sipho (genitive siphonis) "a siphon," from Greek siphon "pipe, tube for drawing wine from a cask," of unknown origin. Related: Siphonal.

siphon (v.)

1859, from siphon (n.). Figurative sense of "to draw off, divert" is recorded from 1940. Related: Siphoned; siphoning.

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Definitions of siphon from WordNet
1
siphon (v.)
convey, draw off, or empty by or as if by a siphon;
Synonyms: syphon / siphon off
siphon (v.)
move a liquid from one container into another by means of a siphon or a siphoning action;
siphon gas into the tank
2
siphon (n.)
a tube running from the liquid in a vessel to a lower level outside the vessel so that gravity forces the liquid through the tube;
Synonyms: syphon
siphon (n.)
a tubular organ in an aquatic animal (especially in mollusks) through which water can be taken in or expelled;
Synonyms: syphon
From wordnet.princeton.edu