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opacity the quality, state, or degree of being opaque; lack of transparency. [4 definitions]
opal a variously colored, often iridescent, hydrated form of silica often used as a semiprecious stone.
opalescent exhibiting a spectrum of colors or changing colors like that of an opal; iridescent. [2 definitions]
opaline like opal; opalescent. [2 definitions]
opaque not allowing light to pass through. (Cf. transparent.) [6 definitions]
op art a style of abstract, usu. hard-edged art in which forms, spaces, and colors are deliberately arranged to produce optical ambiguities and illusions.
op. cit. abbreviation of "opere citato" (Latin); in the work cited.
ope (archaic) to open. [2 definitions]
OPEC abbreviation of "Organization of Petroleum Exporting Countries."
op-ed a newspaper page, generally appearing opposite the editorial page, that presents the submitted opinions or contributions of readers, or a single signed article on such a page. [2 definitions]
open allowing entry or access; not shut, enclosed, or fastened. [27 definitions]
openable combined form of open.
open admissions the policy of admitting any student who desires to attend a university, regardless of proficiency.
open-air being, done, or occurring outdoors.
open air the outdoors.
open-and-shut (informal) not requiring much deliberation; not presenting ambiguity or difficulty; immediately obvious.
open chain in chemistry, a linear series of covalent atoms not joined at the ends into a cycle, such as an aliphatic compound.
open circuit an electrical circuit that is broken and carries no current.
open city a city in a war zone that is officially declared to be demilitarized and open to enemy occupation, and is thus rendered immune, by international law, to attack or bombardment.
open door free and unrestricted admission or access; unhindered opportunity. [2 definitions]
open-end lacking designated or agreed-upon limits.