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- Siphon - n. - A device, consisting of a pipe or tube bent so as to form two branches or legs of unequal length, by which a liquid can be transferred to a lower level, as from one vessel to another, over an intermediate elevation, by the action of the pressure of the atmosphere in forcing the liquid up the shorter branch of the pipe immersed in it, while the continued excess of weight of the liquid in the longer branch (when once filled) causes a continuous flow. The flow takes place only when the discharging extremity of the pipe ia lower than the higher liquid surface, and when no part of the pipe is higher above the surface than the same liquid will rise by atmospheric pressure; that is, about 33 feet for water, and 30 inches for mercury, near the sea level.
- Siphon - n. - One of the tubes or folds of the mantle border of a bivalve or gastropod mollusk by which water is conducted into the gill cavity. See Illust. under Mya, and Lamellibranchiata.
- Siphon - n. - The anterior prolongation of the margin of any gastropod shell for the protection of the soft siphon.
- Siphon - n. - The tubular organ through which water is ejected from the gill cavity of a cephaloid. It serves as a locomotive organ, by guiding and confining the jet of water. Called also siphuncle. See Illust. under Loligo, and Dibranchiata.
- Siphon - n. - The siphuncle of a cephalopod shell.
- Siphon - n. - The sucking proboscis of certain parasitic insects and crustaceans.
- Siphon - n. - A sproutlike prolongation in front of the mouth of many gephyreans.
- Siphon - n. - A tubular organ connected both with the esophagus and the intestine of certain sea urchins and annelids.
- Siphon - n. - A siphon bottle.
- Siphon - v. t. - To convey, or draw off, by means of a siphon, as a liquid from one vessel to another at a lower level.
- Siphonage - n. - The action of a siphon.
- Siphonal - a. - Of or pertaining to a siphon; resembling a siphon.
- Siphonarid - n. - Any one of numerous species of limpet-shaped pulmonate gastropods of the genus Siphonaria. They cling to rocks between high and low water marks and have both lunglike organs and gills.
- Siphonata - n. pl. - A tribe of bivalve mollusks in which the posterior mantle border is prolonged into two tubes or siphons. Called also Siphoniata. See Siphon, 2 (a), and Quahaug.
- Siphonate - a. - Having a siphon or siphons.
- Siphonate - a. - Belonging to the Siphonata.
- Siphonet - n. - One of the two dorsal tubular organs on the hinder part of the abdomen of aphids. They give exit to the honeydew. See Illust. under Aphis.
- Siphonia - n. - A former name for a euphorbiaceous genus (Hevea) of South American trees, the principal source of caoutchouc.
- Siphonia - pl. - of Siphonium
- Siphoniata - n. pl. - Same as Siphonata.
- Siphonic - a. - Of or pertaining to a siphon.
- Siphonifer - n. - Any cephalopod having a siphonate shell.
- Siphoniferous - a. - Siphon-bearing, as the shell of the nautilus and other cephalopods.
- Siphonium - n. - A bony tube which, in some birds, connects the tympanium with the air chambers of the articular piece of the mandible.
- Siphonobranchiata - n. pl. - A tribe of gastropods having the mantle border, on one or both sides, prolonged in the form of a spout through which water enters the gill cavity. The shell itself is not always siphonostomatous in this group.
- Asiphonate - a. - Destitute of a siphon or breathing tube; -- said of many bivalve shells.
- Siphonate - a. - Having a siphon or siphons.
- Siphon - n. - A siphon bottle.
- Phragmosiphon - n. - The siphon of a phragmocone.
- Infundibulum - n. - The siphon of Cephalopoda. See Cephalopoda.
- Calamary - n. - A cephalopod, belonging to the genus Loligo and related genera. There are many species. They have a sack of inklike fluid which they discharge from the siphon tube, when pursued or alarmed, in order to confuse their enemies. Their shell is a thin horny plate, within the flesh of the back, shaped very much like a quill pen. In America they are called squids. See Squid.
- Siphoid - n. - A siphon bottle. See under Siphon, n.