PHENOLPHTHALEIN
phenolphthalein
(noun) a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8
Source: WordNet® 3.1
Etymology
Noun
phenolphthalein (countable and uncountable, plural phenolphthaleins)
(chemistry) A quinone derivative used as a pH indicator, and once used as a laxative
Source: Wiktionary
Phe`nol*phthal"e*in, n., or Phenol phthalein. (Chem.)
Definition: A white or yellowish white crystalline substance, C20H14O4, formed by condensation of the anhydride of phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids. This reaction, being very delicate, is used as an indicator.
Source: Webster’s Unabridged Dictionary 1913 Edition
Word of the Day
16 November 2024
LEAVE
(verb) go and leave behind, either intentionally or by neglect or forgetfulness; “She left a mess when she moved out”; “His good luck finally left him”; “her husband left her after 20 years of marriage”; “she wept thinking she had been left behind”
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