TACHYLYTE
Tach"y*lyte, n. Etym: [Gr. (Min.)
Defn: A vitreous form of basalt; — so called because decompposable by acids and readily fusible.
TACHYMETER
Ta*chym"e*ter, n. [Tachy- + -meter.]
1. (Surveying) An instrument, esp. a transit or theodolite with stadia wires, for determining quickly the distances, bearings, and elevations of distant objects.
2. A speed indicator; a tachometer.
TACHYMETRY
Ta*chym"e*try, n.
Defn: The science or use of the tachymeter. — Ta`chy*met"ric (#), a.
TACHYSCOPE
Tach"y*scope, n. [Gr. quick + -scope.]
Defn: An early form of antimated-picture machine, devised in 1889 by Otto Anschütz of Berlin, in which the chronophotographs were mounted upon the periphery of a rotating wheel.
TACIT
Tac"it, a. Etym: [L. tacitus, p.p. of tacere to be silent, to pass
over in silence; akin to Goth. to be silent, Icel. , OHG. dagen: cf.
F. tacite. Cf. Reticent.]