A siphon is a tube in an inverted U shape which causes a liquid, under the pull of gravity, to flow upwards and then downwards to discharge at a lower level.
The term siphon may also refer to other structures where flowing liquids are involved, or because the object is shaped like a siphon:
- Siphon (insect anatomy)
- Siphon (mollusc), an organ of many aquatic molluscs through which water (or air) flows
- Oral siphon of Urochordata
- Carotid siphon, a portion of the human internal carotid artery running through the cavernous sinus, called siphon because of its shape
- sump (cave), a passage in a cave that is submerged under water
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