The Collaborative International Dictionary of English v.0.48:

Rachitis \Ra*chi"tis\ (r[.a]*k[imac]"t[i^]s), n. [NL., fr. Gr.
   "rachi^tis (sc. nosos), fr. "ra`chis, -ios, the spine.]
   [Written also rhachitis.]
   1. (Med.) Literally, inflammation of the spine, but commonly
      applied to the rickets. See Rickets.
      [1913 Webster]

   2. (Bot.) A disease which produces abortion in the fruit or
      seeds. --Henslow.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rhachitis \Rha*chi"tis\, n. [NL.]
   See Rachitis.
   [1913 Webster]