欠けつ号ごう

noun

missing issue (of a magazine or periodical)

Used in publishing contexts to refer to an issue of a serial publication that is absent from a collection or archive.

• この雑ざっ誌しは欠けつ号ごうが多おおくて、全ぜん巻かんそろえるのが難むずかしい。

  This magazine has many missing issues, so it's hard to collect the complete set.