Etymology
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rickets (n.)

disease caused by vitamin D deficiency, 1630s, of uncertain origin (see note in OED). Originally a local name for the disease in Dorset and Somerset, England. Some derive it from a Dorset word, rucket "to breathe with difficulty," but the sense connection is difficult. The Modern Latin name for the disease, rachitis, comes from Greek rhakhis "spine" (see rachitic), but this was chosen by English physician Daniel Whistler (1619-1684) for resemblance to rickets.

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Definitions of rickets

rickets (n.)
childhood disease caused by deficiency of vitamin D and sunlight associated with impaired metabolism of calcium and phosphorus;
Synonyms: rachitis
From wordnet.princeton.edu