enchiridion (n.)youdaoicibaDictYouDict[enchiridion 词源字典]
1540s, "a handbook," from Late Latin, from Greek enkheiridion, neuter of enkheiridios "that which is held in the hand," from en "in" (see en- (2)) + kheir "hand" (see chiro-) + diminutive suffix -idion.[enchiridion etymology, enchiridion origin, 英语词源]