تلفظ بین المللی : /sˈaɪtfəlnəs/ تلفظ : [s'aItf@Ln@s]
English
The state of being sightful; perspicuity.
One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenol phthaleïn. Their alkaline solutions are fluorescent. Phenol phthalein, a white or yellowish white crystalline substance made from phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolor...
