si·phon also sy·phon 
(sīfən)
(sīfən)n.
1. A tube that carries a liquid from a higher level up and over a barrier and then down to a lower level, with the flow maintained by gravity and atmospheric pressure as long as the tube remains filled.
2. Zoology A tubular organ, especially of aquatic invertebrates such as squids or clams, by which water is taken in or expelled.
v. si·phoned, si·phon·ing, si·phons also sy·phoned or sy·phon·ing or sy·phons
v.tr.
1. To draw off or convey (a liquid) through a siphon.
2. To take or transfer (something), often illicitly: siphon money from an account; siphon customers from a competitor.
v.intr.
To pass through a siphon.
[Middle English, from Latin sīphō, sīphōn-, from Greek sīphōn.]
siphon·al, si·phonic adj.
siphon