Definition of opal

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Opal (n.) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity..

Lern More About Opal

Silica :: Silica (n.) Silicon dioxide, SiO/. It constitutes ordinary quartz (also opal and tridymite), and is artifically prepared as a very fine, white, tasteless, inodorous powder..
Autocephalous :: Autocephalous (a.) Having its own head; independent of episcopal or patriarchal jurisdiction, as certain Greek churches..
Ropalic :: Ropalic (a.) See Rhopalic.
Te Deum :: Te Deum () An ancient and celebrated Christian hymn, of uncertain authorship, but often ascribed to St. Ambrose; -- so called from the first words Te Deum laudamus. It forms part of the daily matins of the Roman Catholic breviary, and is sung on all occasions of thanksgiving. In its English form, commencing with words, We praise thee, O God, it forms a part of the regular morning service of the Church of England and the Protestant Episcopal Church in America..
Tersanctus :: Tersanctus (n.) An ancient ascription of praise (containing the word Holy -- in its Latin form, Sanctus -- thrice repeated), used in the Mass of the Roman Catholic Church and before the prayer of consecration in the communion service of the Church of England and the Protestant Episcopal Church. Cf. Trisagion..
Episcopal :: Episcopal (a.) Belonging to, or vested in, bishops; as, episcopal jurisdiction or authority; the episcopal system..
Opalescent :: Opalescent (a.) Reflecting a milky or pearly light from the interior; having an opaline play of colors.
Harvest-home :: Harvest-home (n.) A service of thanksgiving, at harvest time, in the Church of England and in the Protestant Episcopal Church in the United States..
Rhopalium :: Rhopalium (n.) One of the marginal sensory bodies of medusae belonging to the Discophora.
Unbishop :: Unbishop (v. t.) To deprive, as a city, of a bishop; to deprive, as a clergyman, of episcopal dignity or rights..
Opalesced :: Opalesced (imp. & p. p.) of Opalesc.
Low-church :: Low-church (a.) Not placing a high estimate on ecclesiastical organizations or forms; -- applied especially to Episcopalians, and opposed to high-church. See High Church, under High..
Nasopalatine :: Nasopalatine (a.) Connected with both the nose and the palate; as, the nasopalatine or incisor, canal connecting the mouth and the nasal chamber in some animals; the nasopalatine nerve..
Opalescing :: Opalescing (p. pr. & vb. n.) of Opalesc.
Opalized :: Opalized (imp. & p. p.) of Opaliz.
Peritropal :: Peritropal (a.) Rotatory; circuitous.
Fiorite :: Fiorite (n.) A variety of opal occuring in the cavities of volcanic tufa, in smooth and shining globular and botryoidal masses, having a pearly luster; -- so called from Fiora, in Ischia..
Peritropous :: Peritropous (a.) Peritropal.
Adularia :: Adularia (n.) A transparent or translucent variety of common feldspar, or orthoclase, which often shows pearly opalescent reflections; -- called by lapidaries moonstone..
Clerk :: Clerk (n.) A parish officer, being a layman who leads in reading the responses of the Episcopal church service, and otherwise assists in it..
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