Hydraulic Hy*drau"lic, a. [F. hydraulique, L. hydraulicus, fr. Gr. ?, ?, a water organ; "y`dwr water + ? flute, pipe. See {Hydra}.] Of or pertaining to hydraulics, or to fluids in motion; conveying, or acting by, water; as, an hydraulic clock, crane, or dock. [1913 Webster]

{Hydraulic accumulator}, an accumulator for hydraulic machinery of any kind. See {Accumulator}, 2.

{Hydraulic brake}, a cataract. See {Cataract}, 3.

{Hydraulic cement}, a cement or mortar made of hydraulic lime, which will harden under water.

{Hydraulic elevator}, a lift operated by the weight or pressure of water.

{Hydraulic jack}. See under {Jack}.

{Hydraulic lime}, quicklime obtained from hydraulic limestone, and used for cementing under water, etc.

{Hydraulic limestone}, a limestone which contains some clay, and which yields a quicklime that will set, or form a firm, strong mass, under water.

{Hydraulic main} (Gas Works), a horizontal pipe containing water at the bottom into which the ends of the pipes from the retorts dip, for passing the gas through water in order to remove ammonia.

{Hydraulic mining}, a system of mining in which the force of a jet of water is used to wash down a bank of gold-bearing gravel or earth. [Pacific Coast]

{Hydraulic press}, a hydrostatic press. See under {Hydrostatic}.

{Hydraulic propeller}, a device for propelling ships by means of a stream of water ejected under water rearward from the ship.

{Hydraulic ram}, a machine for raising water by means of the energy of the moving water of which a portion is to be raised. When the rush of water through the main pipe d shuts the valve at a, the momentum of the current thus suddenly checked forces part of it into the air chamber b, and up the pipe c, its return being prevented by a valve at the entrance to the air chamber, while the dropping of the valve a by its own weight allows another rush through the main pipe, and so on alternately.

{Hydraulic valve}. (Mach.) (a) A valve for regulating the distribution of water in the cylinders of hydraulic elevators, cranes, etc. (b) (Gas Works) An inverted cup with a partition dipping into water, for opening or closing communication between two gas mains, the open ends of which protrude about the water. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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  • hydraulic — hy‧draul‧ic [haɪˈdrɒlɪk, ˈdrɔː ǁ ˈdrɒː ] adjective moved or operated by the pressure of water or other liquids: • The factory makes hydraulic cylinders for use in the steel industry. hydraulically adverb : • hydraulically operated doors * * *… …   Financial and business terms

  • hydraulic — [hī drô′lik, hīdrä′lik] adj. [Fr hydraulique < L hydraulicus < Gr hydraulikos, of a water organ < hydraulis, water organ < hydōr, WATER + aulos, tube, pipe < IE base * aulos > (with metathesis) L alvus, the belly] 1. of… …   English World dictionary

  • hydraulic — c.1600, from Gk. hydraulikos organon water organ, from hydr , stem of hydor water (see WATER (Cf. water) (n.1)) + aulos musical instrument, hollow tube (see ALVEOLUS (Cf. alveolus)). Extended by the Romans to other kinds of water engines …   Etymology dictionary

  • hydraulic — ► ADJECTIVE 1) relating to a liquid moving in a confined space under pressure. 2) relating to the science of hydraulics. 3) (of cement) hardening under water. DERIVATIVES hydraulically adverb. ORIGIN Greek hudraulikos, from hudro water + aulos… …   English terms dictionary

  • hydraulic — adj. 1 (of water, oil, etc.) conveyed through pipes or channels usu. by pressure. 2 (of a mechanism etc.) operated by liquid moving in this manner (hydraulic brakes; hydraulic lift). 3 of or concerned with hydraulics (hydraulic engineer). 4… …   Useful english dictionary

  • hydraulic — adjective Etymology: Latin hydraulicus, from Greek hydraulikos, from hydraulis hydraulic organ, from hydr + aulos reed instrument more at alveolus Date: 1661 1. operated, moved, or effected by means of water 2. a. of or relating to hydraulics …   New Collegiate Dictionary

  • hydraulic — hy|draul|ic [haıˈdrɔlık, ˈdro: US ˈdro: ] adj [usually before noun] [Date: 1600 1700; : Latin; Origin: hydraulicus, from Greek, from hydraulis organ worked by water ] moved or operated by the pressure of water or other liquid ▪ a hydraulic pump ▪ …   Dictionary of contemporary English

  • hydraulic — [[t]haɪdrɒ̱lɪk, AM drɔ͟ːl [/t]] ADJ: ADJ n Hydraulic equipment or machinery involves or is operated by a fluid that is under pressure, such as water or oil. The boat has no fewer than five hydraulic pumps. Derived words: hydraulically ADV ADV… …   English dictionary

  • hydraulic — adjective (usually before noun) moved or operated by the pressure of water on other liquid: a hydraulic pump | hydraulic brakes hydraulically / kli/ adverb …   Longman dictionary of contemporary English

  • hydraulic — UK [haɪˈdrɔːlɪk] / US [haɪˈdrɔlɪk] adjective science a hydraulic machine uses the pressure of water or oil to make it work a hydraulic pump …   English dictionary

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