One of the mysteries of the English language finally explained.
1An alpine plant, Petrocallis pyrenaica (sometimes called Draba pyrenaica), of the family Brassicaceae (Cruciferae), typically having pale pink or lilac flowers. Now rare.
2A yellow and blackish-brown angelfish, Holacanthus tricolor (family Pomacanthidae), found on coral reefs in the Caribbean.
Late 19th century; earliest use found in William Robinson (1838–1935), horticulturist and publisher. From rock + beauty.
rock beauty/ˈrɒk ˌbjuːti/
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