octane

[Lat.oct(o)=eight; suff. -ane.] Chem.: C8H18. The name given to the hydro car of carbon. Obtained in the pure state by heating bons of the paraffin series containing eight atoms octyl iodide with zinc and dilute hydrochloric acid. It is a mobile liquid, boils at 125°, and has a specific gravity of 7032. oct-ăn-gu-lar, a. [Pref. oct-, and Eng. angu Geom.: Having eight angles. lar.] Oct-ăn-gu-lar-ne , s . [Eng.octangular; -ne .] The quality or state of being octangular, or of having eight angles. Õc-tănş, s. [Lat. octans =an eighth part, octo = eight.] Astron.: The Octant; one of Lacaille's Southern constellations. IMG:content-0227.png:[blocks in formation] October *öc'-ta-teüch, *oc-to-teūch s. [Latin oct a teuch us, from Gr. octateuchos, oktō =eight, and teuchos a book, a composition; Fr. octateuque ; Sp. octateuco .] A collection of eight books; spec if., the first eight books of the Old Testament. "Not unlike unto that [style] of Theodoret in his questions upon the octoteuch ."-Hanmer: View of Antiq., p. 37. oc-tave (a as 1), a. & s. (Fr., from Lat. octavus =eighth, from octo- = eight; Span. octavo; Ital. ottavo.] A. As adj.: Denoting eight, consisting of eight. B. As substantive: I. Ordinary Language: 1. A small cask of wine; the eighth part of a pipe. 2. A verse or stanza of eight lines. 3. In the sonnet the first two stanzas of four lines each. II. Technically: 1. Ecclesiastical: (1) The eighth day after a particular church festival, the day of the feast itself being counted. "When his wondrous octave roll'd again, He brought a royal infant in his train." Dryden: Britannia Rediviva , 21. (2) The eight days following a particular church festival. "To be holden in the octaues of the Epiphanie."Holinshed: Henry III . (an. 1225.) 2. Music : (1) The interval of an eighth. It may be major, minor, or augmented. It was the diapason of the Greek system. (2) The first note of the harmonic scale. (3) An organ stop of four feet pitch on the manu als, or eight feet on the pedals.