1620s, from Modern Latin rosa crucis (DuCange) or crux, Latinization of German Rosenkreuz, French rosecroix, from the secret society's reputed founder Christian Rosenkreuz, said to date from 1484, but not mentioned before 1614. As an adjective from 1660s.
Rosetta Stone
rosette
rose-water
rosewood
Rosh Hashanah
Rosicrucian
rosin
Rosinante
roster
rostral
rostrum
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