foldout

名词 foldout:

1. an oversize page that is folded in to a book or magazine
   同义词：gatefold

fold.out

n.（名词）
Printing A folded insert or section, as of a cover, whose full size exceeds that of the regular page.
【印刷术】 折页：折叠起来的插入物或部分，比如尺寸超过了一般的书页尺寸的画页
A piece or part, as of furniture, that folds out or down from a closed position.
折页：如家具的一块或一部分，可以从合起的位置折出来或折下去

【引伸】
fold.out.
adj.（形容词）