One of the mysteries of the English language finally explained.
A disorder of lambs characterized by incoordination of movement and muscular weakness or paralysis, and caused by copper deficiency during fetal development.
Early 20th century. From South American Spanish renguera limp, lameness from renguear to limp (1853; compare Castilian Spanish renquear; from rengo, South American variant of Castilian and Central American Spanish renco lame, limping (1570; compare Old Occitan ranc, Catalan ranc, Italian ranco; ultimately related to wrench: see further J. Corominas Diccionario crítico etimológico castellano e hispánico at renco)) + -era, suffix forming nouns.
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