n.
Pronunciation: ' r ō -d ə - ˌ m ē n
Function: noun
Usage: often cap
Etymology: International Scientific Vocabulary
Date: 1888
: 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