adjective Medicine relating to or suffering from rickets.

— ORIGIN from Greek rhakhitis ‘rickets’, from rhakhis ‘spine’.

Source: AskOxford.com.

Hence it became the better part of wisdom to die in the full flower of life, since, for example, a rachitic old man, toothless, short-winded and dyspeptic, could never fully enjoy the banquets, songs and nymphs of paradise.

Source: Tales of the Dying Earth by Jack Vance.