D defs.my
Entry 1 sense Webster, 1913

Roseo-

· Ro·se·o- · IPA
01 A prefix (also used adjectively) signifying rose-red; specifically used to designate certain rose-red compounds (called roseo-cobaltic comp…
  1. 1.
    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-.(Chem.) See: Luteo