This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A handbook; a manual.

n. A handbook or manual.

n. Handbook; a manual of devotions.

n. A book to be carried in the hand; a manual; a handbook.

n. Specifically— A Roman Catholic service-book containing the Little Office of the Virgin.

n. An ecclesiastical manual of the Greek Church.

n. a concise reference book providing specific information about a subject or location

"The plot twists were a little too convenient, and the language at times was a little unbelievable (okay she's an academic, but does that really give her the right to use the word enchiridion to describe a parenting book?)."

enchiridia   

handbook