Etymology
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rosacea (n.)

type of acne, 1876, short for acne rosacea (1833), from fem. of Latin rosaceus "rose-colored," from rosa (see rose (n.1)).

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Definitions of rosacea

rosacea (n.)
a skin disease of adults (more often women) in which blood vessels of the face enlarge resulting in a flushed appearance;
Synonyms: acne rosacea
From wordnet.princeton.edu