enchiridion

 
Pronunciation: /ˌɛnkʌɪˈrɪdɪən/

noun (plural enchiridions or enchiridia /-dɪə/)

formal
  • a book containing essential information on a subject.

Origin:

late Middle English: via late Latin from Greek enkheiridion, from en- 'within' + kheir 'hand' + the diminutive suffix -idion