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Webster's 1913 Dictionary
MUREXIDE
Mu
*
rex
"
ide,
n.
Etym:
[L.
murex
the
purple
fish,
purple.
] (
Chem.
)
Defn: A
crystalline
nitrogenous
substance
having
a
splendid
dichroism,
being
green
by
reflected
light
and
garnet-red
by
transmitted
light.
It
was
formerly
used
in
dyeing
calico,
and
was
obtained
in
a
large
quantities
from
guano.
Formerly
called
also
ammonium
purpurate.