One of the mysteries of the English language finally explained.
1A scorpion that frequents rocky places: (a) any of several large black scorpions of the Old World, especially Pandinus imperator of Africa; (b) (more fully "flat rock scorpion") any of several flattened scorpions of the genus Hadogenes, of southern Africa.
2British Military slang. A nickname for: a civilian inhabitant of Gibraltar.
Late 18th century; earliest use found in William Paterson (1755–1810), army officer and naturalist. From rock + scorpion.
rock scorpion/ˈrɒk ˌskɔːpɪən/
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