PHTHALEINS
Noun
phthaleins
plural of phthalein
Source: Wiktionary
PHTHALEIN
Phthal"e*in, n. Etym: [See Phthalic.] (Chem.)
Definition: One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenol phthaleĂŻn. 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 decolorized by acids, and as this reaction is exceedingly delicate it is used as an indicator.
Source: Webster’s Unabridged Dictionary 1913 Edition
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19 April 2025
CATCH
(verb) grasp with the mind or develop an understanding of; “did you catch that allusion?”; “We caught something of his theory in the lecture”; “don’t catch your meaning”; “did you get it?”; “She didn’t get the joke”; “I just don’t get him”
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