from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several synthetic red to pink dyes having brilliant fluorescent qualities.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. any of a class of pink to red polycyclic fluorone dyes
from The Century Dictionary and Cyclopedia
- n. A phthalein formed from meta-minophenol or one of its derivatives. The simplest rhodamine, C20H13O3(NH2)2, is formed from metaminophenol and phthalic anhydrid. The rhodamines, especially those which are alkylated, are strongly colored. They are usually red, and in solution show greenish fluorescence.
From rhodo- + amine. (Wiktionary)