三みつ折おり

noun which may take the genitive case particle 'no', noun

threefold; folded in three

Describes something folded into three parts, such as a letter, brochure, or mattress. Often used as a noun or with の to modify another noun.

• 三みつ折おりのパンフレットを作さく成せいした。

  We created a tri-fold brochure.

• 手て紙がみを三みつ折おりにして封ふう筒とうに入いれる。

  Fold the letter in three and put it in the envelope.