combining form of Gr. ταχύ-ς swift, used in the formation of some scientific terms. Tachhydrite, Tachydrite, Min. [ad. Ger. tachhydrit (Rammelsberg, 1856), contr, for *tachyhydrit, f. Gr. ὔδωρ water + -ITE1: from its property of deliquescing readily], a chloride of calcium and magnesium found at Stassfurt in Prussian Saxony. Tachydidaxy [Gr. δίδαξις teaching]: see quot. Tachydrome [Gr. -δρομ-ος -running, -runner, δρόμος a race-course], anglicized form of Tachydromus, Illiger’s name for the ornithological genus Cursorius, a small group of birds allied to the Plovers; = COURSER3; so Tachydromian, a bird of this group; Tachydromous a., of the tachydromes; cursorial. Tachygen, Biol. [-GEN1], the sudden appearance of an organ in evolution; the part so appearing (Webster, Suppl., 1902); so Tachygenesis [GENESIS], acceleration in development by the shortening or suppression of intervening stages; Tachygenetic a., of or exhibiting tachygenesis; Tachygenic a., appearing or developing suddenly (Webster, Suppl., 1902). Tachyglossal a., Zool. [Gr. γλῶσσα tongue], of a tongue: capable of being quickly thrust forth and retracted, as that of the ant-eater; so Tachyglossate a., having a tachyglossal tongue; pertaining to the Tachyglossidæ, a family of aculeate monotrematous mammals, of which the typical genus Tachyglossus contains the Echidna or porcupine ant-eater of Australia; Tachyglossid, an animal of this family. Tachyiater [Gr. ἰἀτρός healer], ‘one who cures speedily’ (Syd. Soc. Lex., 1898); hence Tachyiatry, the art of quick healing (ibid.). Tachypetous a. [πετ-, stem of πέτεσθαι to fly + -OUS], swift-flying (Mayne, Expos. Lex., 1860). Tachypnœa [Gr. -πνοια, f. πνέ-ειν to breathe], hurried or unusually rapid respiration. Tachyscope [-SCOPE], a kind of kinetoscope, in which a series of representations of an object in successive phases of motion are rapidly revolved, so as to present the appearance of actual motion. Tachythanatous a. [Gr. θάνατος death + -OUS], killing quickly, rapidly fatal. Tachytomy, tachyotomy [Gr. τομή a cutting], the art of rapid surgical or anatomical operation.
1866. Brande & Cox, Dict. Sci., etc. II. 532/3. *Tachydrite.
1868. Dana, Min., 119. Tachhydrite.… Color yellowish. Transparent to translucent. Very deliquescent on exposure.
1846. Worcester, *Tachydidaxy, a short method of teaching. Scudamore.
1842. Brande, Dict. Sci., etc. *Tachydromians, the name of a family of wading birds, of which the genus Tachydromus is the type.
1860. Mayne, Expos. Lex., 1247/1. Having the Tachydromus for their type: *tachydromous.
1893. Hyatt, in Proc. Boston Soc. Nat. Hist., 77. Thus, from Cope’s point of view, *tachygenesis is the law of progression, and retardation is the law of retrogression, and they are both essential parts of his law of acceleration and retardation. Ibid., 79. Normal types in which tachygenesis occurs in a marked way might be called *tachygenetic.
1891. Cent. Dict., *Tachyglossal, *Tachyglossate.
1898. Syd. Soc. Lex., *Tachypnœa.
1899. Allbutt’s Syst. Med., VIII. 109. There is an hysterical dyspnœa, or rather tachypnœa; the respirations are hurried.
1889. Sci. Amer., 16 Nov., 310/1. Mr. Anschuetz has invented apparatus by means of which these [animated] pictures may be exhibited in a very perfect manner. This instrument … is known as the ‘electrical *tachyscope.’
1860. Mayne, Expos. Lex., *Tachythanatous.
1890. in Billings, Nat. Meit. Dict.
1898. Syd. Soc. Lex., *Tachyotomy, *Tachytomy.
