Definition of Phenolphthalein
Phe`nol`phthal´e`in
n.
1.
(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
.
Related Words
acid-base
indicator
,
laxative
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