A bent pipe or tube with one end lower than the other, in which hydrostatic pressure exerted due to the force of gravity moves liquid from one reservoir to another.
From Middle French siphon, from Old French sifon, from Latin sipho, from Ancient Greek σίφων ("pipe, tube"), of uncertain origin; possibly related to Latin tibia ("pipe, flute of bone"), reflecting a hypothetical late Proto-Indo-European *twi-, *twibʰ- root, but the irregular forms suggest a non-Indo-European loan (i.e. ) source.
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