n. [ F. aérostat, fr. Gr. &unr_; air + &unr_; placed. See Statics. ] 1. (Aëronautics) A balloon, especially a passive balloon; a balloon without motive power. Contrasted with aerodyne. [ 1913 Webster +Webster 1913 Suppl. ]

2. A balloonist; an aëronaut. [ 1913 Webster ]

{ } a. [ Aëro- + Gr. &unr_;: cf. F. aérostatique. See Statical, Statics. ] 1. Of or pertaining to aërostatics; pneumatic. [ 1913 Webster ]

2. Aëronautic; as, an aërostatic voyage. [ 1913 Webster ]

n. The science that treats of the equilibrium of elastic fluids, or that of bodies sustained in them. Hence it includes aëronautics. [ 1913 Webster ]

n. [ Cf. F. aérostation the art of using aërostats. ] 1. That part of aëronautics that deals with passive balloons; the art of raising and guiding balloons in the air. [ 1913 Webster +Webster 1913 Suppl. ]

2. The science of weighing air; aërostatics. [ Obs. ] [ 1913 Webster ]

a. [ Gr. &unr_; center + &unr_; checking. ] (Physiol.) A term applied to the action of nerve force in the spinal center. Marshall Hall. [ 1913 Webster ]

a. Pertaining to electrostatics. [ 1913 Webster ]

n. (Physics) That branch of science which treats of statical electricity or electric force in a state of rest. [ 1913 Webster ]

n. [ Gr. gy^ros ring, circle + "ista`nai to cause to stand.] (Physics) A modification of the gyroscope, consisting essentially of a fly wheel fixed inside a rigid case to which is attached a thin flange of metal for supporting the instrument. It is used in studying the dynamics of rotating bodies. [1913 Webster]

a. (Physics) Of or pertaining to the gyrostat or to gyrostatics. [ 1913 Webster ]

n. (Physics) The doctrine or theory of the gyrostat, or of the phenomena of rotating bodies. [ 1913 Webster ]

n. 1. A contrivance or apparatus to prevent the explosion of steam boilers.

2. A device, usually electrical, for indicating or regulating the height of water in a reservoir or receptacle. [ Webster 1913 Suppl. ]

{ } a. [ Hydro-, 1 + Gr. &unr_; causing to stand: cf. F. hydrostatique. See Static. ] Of or relating to hydrostatics; pertaining to, or in accordance with, the principles of the equilibrium of fluids. [ 1913 Webster ]

The first discovery made in hydrostatics since the time of Archimedes is due to Stevinus. Hallam. [ 1913 Webster ]

Hydrostatic balance, a balance for weighing substances in water, for the purpose of ascertaining their specific gravities. --
Hydrostatic bed, a water bed. --
Hydrostatic bellows, an apparatus consisting of a water-tight bellowslike case with a long, upright tube, into which water may be poured to illustrate the hydrostatic paradox. --
Hydrostatic paradox, the proposition in hydrostatics that any quantity of water, however small, may be made to counterbalance any weight, however great; or the law of the equality of pressure of fluids in all directions. --
Hydrostatic press, a machine in which great force, with slow motion, is communicated to a large plunger by means of water forced into the cylinder in which it moves, by a forcing pump of small diameter, to which the power is applied, the principle involved being the same as in the hydrostatic bellows. Also called hydraulic press, and Bramah press. In the illustration, a is a pump with a small plunger b, which forces the water into the cylinder c, thus driving upward the large plunder d, which performs the reduced work, such as compressing cotton bales, etc. [ 1913 Webster ]

adv. According to hydrostatics, or to hydrostatic principles. Bentley. [ 1913 Webster ]

n. One who is versed or skilled in hydrostatics. [ R. ] [ 1913 Webster ]

n. [ Cf. F. hydrostatique. ] (Physics) The branch of science which relates to the pressure and equilibrium of nonelastic fluids, as water, mercury, etc.; the principles of statics applied to water and other liquids. [ 1913 Webster ]

n. [ Gr. &unr_; wet + &unr_;. See Statics. ] The science or art of comparing or measuring degrees of moisture. Evelyn. [ 1913 Webster ]

a. [ Gr. &unr_; standing before, fr. &unr_; to set before; &unr_; before + &unr_; to set: cf. F. prostate. ] (Anat.) Standing before; -- applied to a gland which is found in the males of most mammals, and is situated at the neck of the bladder where this joins the urethra. -- n. The prostate gland. [ 1913 Webster ]

a. (Anat.) Of or pertaining to the prostate gland. [ 1913 Webster ]

Prostatic catheter. (Med.) See under Catheter. [ 1913 Webster ]

‖n. [ NL. See Prostate, and -itis. ] (Med.) Inflammation of the prostate. [ 1913 Webster ]

n. [ L. sidus, sideris, a star + Gr. &unr_;&unr_;&unr_; standing, fixed, fr. &unr_;&unr_;&unr_;&unr_; to place. ] (Astron.) An apparatus consisting essentially of a mirror moved by clockwork so as to throw the rays of the sun or a star in a fixed direction; -- a more general term for heliostat. [ 1913 Webster ]

a. (Anat.) Of or pertaining to the bladder and the prostate gland. [ 1913 Webster ]