si·phon / ˈsīfən/ (also sy·phon) • n. a pipe or tube used to convey liquid upward from a container and then down to a lower level by gravity, the liquid being made to enter the pipe by atmospheric pressure. ∎  Zool. a tubular organ in an aquatic animal, esp. a mollusk, through which water is drawn in or expelled.• v. [tr.] draw off or convey (liquid) by means of a siphon. ∎ fig. draw off or transfer over a period of time, esp. illegally or unfairly: he's been siphoning money off the firm.DERIVATIVES: si·phon·age / -nij/ n.si·phon·al / -nəl/ adj. ( Zool. )si·phon·ic / sīˈfänik/ adj.ORIGIN: late Middle English: from French, or via Latin from Greek siphōn ‘pipe.’ The verb dates from the mid 19th cent.

siphon In bivalve molluscs (Bivalvia) and gastropods (Gastropoda), a tube that connects the mollusc to the world outside, funnelling water towards and away from the gills. In bivalves siphons may occur in pairs.

siphon In Bivalvia and Gastropoda, a tube that funnels water towards and away from the gills. In bivalves siphons often occur in pairs.

siphon, syphon bent tube for drawing off liquid by atmospheric pressure. XVII. — F. siphon or L. sīphō, -ōn- — Gr. sī́phōn pipe, tube.