A book containing essential information on a subject.
directions, key, guide, recipe, specification
- ‘I also wrote a book on Faith, Hope, and Charity, at the request of the person to whom I addressed it, that he might have a work of mine which should never be out of his hands, such as the Greeks call an Enchiridion (Handbook).’
Late Middle English via late Latin from Greek enkheiridion, from en- ‘within’ + kheir ‘hand’ + the diminutive suffix -idion.
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