Entry 1 sense Webster, 1913 Rachialgia /(rā`kĭ*ăl"jĭ*ȧ)/ · Ra·chi·al·gi·a · IPA 01 n. A painful affection of the spine; especially, Pott's disease; also, formerly, lead colic. 1. A painful affection of the spine; especially, Pott's disease; also, formerly, lead colic.(Med.)