Meaning

noun inflammation of the vertebral column

noun childhood disease caused by deficiency of vitamin D and sunlight associated with impaired metabolism of calcium and phosphorus

originUnadapted borrowing from New Latin rachitis, used by the British physician Francis Glisson (1597–1677) to refer to rickets, from Koine Greek ῥαχῖτις (rhakhîtis) (in ῥαχῖτις νόσος (rhakhîtis nósos, “spinal inflammation”, literally “spinal disease”)), the feminine form of ῥαχίτης (rhakhítēs, “in or of the spine, spinal”), from Ancient Greek ῥάχῐς (rhákhĭs, “lower part of the back; (anatomy)…

Etymology from Wiktionary, CC BY-SA 3.0