A structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it.

Roget 350: conduit, channel, duct, watercourse, race; head race, tail race; abito^†, aboideau^†, aboiteau [Fr.], bito^†; acequia^†, acequiador^†, acequiamadre^†; arroyo; adit^†, aqueduct, canal, trough, gutter, pantile; flume, ingate^†, runner; lock-weir, tedge^†; vena^†; dike, main, gully, moat, ditch, drain, sewer, culvert, cloaca, sough, kennel, siphon; piscina^†; pipe etc. (tube) 260; funnel; tunnel etc. (passage) 627; water pipe, waste pipe; emunctory^†, gully hole, artery, aorta, pore, spout, scupper; adjutage^†, ajutage^†; hose; gargoyle; gurgoyle^†; penstock, weir; flood gate, water gate; sluice, lock, valve; rose; waterworks.    pipeline.    ... show more

Roget 263: stopper, stopple; plug, cork, bung, spike, spill, stopcock, tap; rammer^†; ram, ramrod; piston; stop-gap; wadding, stuffing, padding, stopping, dossil^†, pledget^†, tompion^†, tourniquet.    cover etc. 223; valve, vent peg, spigot, slide valve.    janitor, doorkeeper, porter, warder, beadle, cerberus, ostiary^†.    ... show more

Dutch: klep
Polish: zastawka

Device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone.

Polish: piston, wentyl

Control consisting of a mechanical device for controlling the flow of a fluid.

Dutch: klep, ventiel, ventielklep
Polish: zawór

The entire one-piece shell of a snail and certain other molluscs.

One of the paired hinged shells of certain molluscs and of brachiopods.