Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

enchiridion
     n : a concise reference book providing specific information
         about a subject or location [syn: {handbook}, {vade mecum}]
     [also: {enchiridia} (pl)]