The Collaborative International Dictionary
Purpureo-
Purpureo- \Pur*pu"re*o-\ A combining form signifying of a purple or purple-red color. Specif. (Chem.), used in designating certain brilliant purple-red compounds of cobaltic chloride and ammonia, similar to the roseocobaltic compounds. See Cobaltic.
Wiktionary
purpureo-
pre. purple; used to designate certain brilliant purple-red compounds of cobaltic chloride and ammonia, similar to the roseocobaltic compounds