One of the mysteries of the English language finally explained.
A deformity of the leg in poultry involving dislocation of the gastrocnemius tendon, thought to be the result of a dietary deficiency.
1930s; earliest use found in Science. From ancient Greek πήρωσις maiming from πηροῦν to maim (from πηρός maimed, of uncertain origin) + -σις.
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