phenolsulfonephthalein
noun
variants
or phenolsulfonphthalein
¦⸗ˌ⸗¦⸗ˌ⸗¦⸗(⸗)⸗
: a red crystalline compound C19H14O5S formed by condensation of the anhydride of ortho-sulfobenzoic acid and phenol and used chiefly as a test of kidney function and as an acid-base indicator
called also phenol red
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Merriam-Webster unabridged
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