noun
instructions; manual; explanatory leaflet
Refers to a printed document that explains how to use a product, assemble something, or follow a procedure. Often a booklet or sheet included with appliances, medicine, or software.
新しいプリンターの説明書を読んでください。
Please read the instruction manual for the new printer.
薬の説明書
The drug's explanatory leaflet lists the side effects.
取扱説明書 is a more formal compound specifically for operating instructions, often used for appliances; 説明書 is a shorter, everyday equivalent.
Compound of 説明 (setsumei, 'explanation') and 書 (sho, 'document'). The reading is standard on'yomi.