enchiridion
Concise Oxford English Dictionary © 2008 Oxford University Press:
enchiridion /ˌɛnkʌɪˈrɪdɪən/
▶noun (pl. enchiridions or enchiridia /-dɪə/) formal a handbook containing essential information on a subject.
– origin ME: via late L. from Gk enkheiridion, from en- ‘within’ + kheir ‘hand’ + the dimin. suffix -idion.
'enchiridion' also found in these Oxford entries:

