Definition of rhodamine
: any of a group of yellowish-red to blue fluorescent dyes
especially
: a brilliant bluish-red dye made by fusing an amino derivative of phenol with phthalic anhydride and used especially in coloring paper and as a biological stain
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Merriam-Webster unabridged
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Time Traveler for rhodamine
The first known use of rhodamine was in 1888
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