coerulein
noun
coe·ru·le·in
variants
or less commonly cerulein
sə̇ˈrülēə̇n
plural -s
often capitalized
: a xanthene dye C20H10O6 that is obtained by heating gallein with concentrated sulfuric acid and that dyes mordanted cotton, silk, and wool green
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Merriam-Webster unabridged
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