The Collaborative International Dictionary of English v.0.48:

Enchiridion \En`chi*rid"i*on\, n. [L., from Gr. ?; ? in + ?
   hand.]
   Handbook; a manual of devotions. --Evelyn.
   [1913 Webster]

WordNet (r) 3.0 (2006):

enchiridion
    n 1: a concise reference book providing specific information
         about a subject or location [syn: handbook,
         enchiridion, vade mecum]