noun
grimoire; book of magic
A book containing magical knowledge, spells, or rituals, often in fantasy settings.
彼は古い魔導書を開いて呪文を唱えた。
He opened the old grimoire and chanted a spell.
Compound of 魔 (ma, 'demon, magic') + 導 (dō, 'guide, lead') or 道 (dō, 'way, path') + 書 (sho, 'book'). The exact historical derivation is uncertain; the spelling 魔導書 is common in modern fantasy.