Preventing, counteracting, or effective against rickets, a disease that weakens bones in children.
From anti- (against) + rachitic (relating to rickets). Rachitic comes from Greek 'rachis' meaning spine, as rickets affects the spine and skeletal system. This medical term developed in the 19th century as doctors studied bone diseases.
Vitamin D is the ultimate 'antirachitic' hero—it literally prevents rickets! This word shows how understanding diseases led to understanding nutrition; before we knew about vitamins, rickets was mysteriously common in children who didn't get enough sunlight.
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