'Roseo-' definitions:
Definition of 'Roseo-'
From: GCIDE
- Roseo- \Ro"se*o-\ (Chem.) A prefix (also used adjectively) signifying rose-red; specifically used to designate certain rose-red compounds (called roseo-cobaltic compounds) of cobalt with ammonia. Cf. Luteo-. [1913 Webster]