[1] When a quantity of water, oil, or other fluid is forced along one end of a line, it also forces against the other end of the line. Because these fluids (unlike a gas) cannot be compressed, when they are forced into a smaller cylinder they multiply the amount of force. Thus a driver can apply a small amount of force on the pedal or lever and a great amount of force is applied to the brake. Used in power steering, clutches, and brake systems.
[2] When used as a verb, it means that oil or excessive gasoline has entered the combustion chamber so that when compression takes place, the fluid cannot be compressed. Something has to give and it is usually the connecting rod that bends. It is found in the expression, "the engine hydrauliced."

Dictionary of automotive terms. 2015.

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  • 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… …   The Collaborative International Dictionary of English

  • 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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