n. 酚酞

[化] 酚酞

[医] 酚肽

[ 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
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Phenolphthalein \Phe`nol*phthal"e*in\, n., or Phenol phthalein
\Phenol phthalein\(Chem.)
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. It is sometimes used as a laxative in
veterinary medicine.
[Webster 1913 Suppl. +PJC]