PRESSURE

n. Pre2sh'u2r. Gr., 0Atyiy. Lat., pre io, pre ura (from premere, to pre ). Fr., pre ion. Ger., Druck, Lh-iickung, Pre ung. Force or stre exerted on a body, as by weight, tension, etc. [a, 48.] After-p. Ger., Nachdrurk. A sense of p. which, for a brief interval, succeeds the removal of a weight from a portion of the body. [Landois (K).] Arterial p. Fr., pre ion arterielle. Ger., Arteriendruck. The blood-p. in the arteries. [K.] Cf. Venous p. Atmospheric p. The p. of the weight of the atmosphere. fa, 48.] Blood-p. Fr., pre ion du sang. Ger., Blutdruck. The p. exerted by the blood against the walls of the heart and of the blood-ve els. [K.] Intra-ocular p. The normal tension of the eye, or the relation between the p. exerted by the coats of the eyeball and that exerted by its contents. [F.] Negative p. Absence of p., also the force of suction. Partial p. In chemistry, the total p. under which water is made to absorb a gas, minus the tension of aqueous vapor at C. P. of inspiration. Ger., Inspirationsdruck, Einathmungsdruck. The p. of the air in the respiratory tract during inspiration. [J, 53.] Venous p. Ger., Aderdruck. The blood-p. in the veins. [K.] PRESTOMIAL,, adj. Pre-stom'i2-aal. From prce, before, and <rroiu.a, the mouth. Projecting in front of the mouth. [L, 353 (a, 39).] [s. 331]