American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
In dental applications, ceramics are valued for their opalescent color and translucence.— Digital50.com Digital 50 Daily Industry News RSS Feed
Other glass imitations, such as the opal, have a tolerably good representation of the "fiery" opal given to them by the admixture, in the glass, of a little oxide of tin, which makes it somewhat opalescent, and in the setting is placed a backing of red, gold, copper, or fiery-coloured tinsel, whilst the glass itself, at the back, is painted very thinly with a paint composed of well washed and dried fish-scales, reduced to an impalpable powder, mixed with a little pure, refined mastic, or other colourless varnish.— The Chemistry, Properties and Tests of Precious Stones
When these streaks pass across the star-like radiations they give the stone the appearance of an eye, the rays forming the iris, the clear, opalescent, or black streak closely resembling the slit in a cat's eye, and when these stones are cut en cabochon_, that is, dome-shaped (see Chapter XI.— The Chemistry, Properties and Tests of Precious Stones
An opalescent, slightly tinted discharge is composed of mucus and indicates a little more severe irritation.— Special Report on Diseases of the Horse

Century Dictionary (1)
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