The Collaborative International Dictionary
Rachialgia
Rachialgia \Ra`chi*al"gi*a\ (r[=a]`k[i^]*[a^]l"j[i^]*[.a]), n. [NL., fr. Gr. "ra`chis backbone + 'a`lgos pain.] (Med.) A painful affection of the spine; especially, Pott's disease; also, formerly, lead colic.
Wiktionary
rachialgia
n. (context medicine English) A painful condition of the spine, especially Pott's disease or (formerly) lead colic.