cat's elbow

cat's elbow

Lichen planus actinicus Dermatology A type of lichen planus, seen in the Middle East, on sun-exposed parts, especially the face Clinical Annular lesions with pigmented centers, centrally thinned epidermis, well-demarcated pale, raised margins.
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The Cat's Elbow and Other Secret Languages (Alvin Schwartz, Farrar Straus & Giroux, 1985) cites the play language as "so easy to learn even a pig could learn it, hence: Pig Latin.