You know what it looks like… but what is it called?
TAKE THE QUIZ“trypan”
The following 2 entries include the term trypan.
trypan blue
noun: a teratogenic disazo dye C34H24N6Na4O14S4 used as an intravital stain and especially formerly as a trypanocide
trypan red
noun: a disazo dye C32H19N6Na5O15S5 formerly used in the treatment of trypanosomiasis
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Merriam-Webster unabridged