Moiré - Moare (English spelling) moiré French

Japanese: モアレ - もあれ（英語表記）moiré フランス語

When two coarsely woven fabrics are overlapped and viewed through the fabric, a wavy pattern (wood grain pattern) can be seen depending on how they are overlapped. This is caused by the interference of light due to the density of the threads in the two fabrics, and is often seen on curtains. There are two ways to create this moire pattern in textile processing: (1) by overlapping two pieces of horizontally ribbed fabric and passing them between hot compression rollers to create a shape, and (2) by pressing them with hot compression rollers engraved with wood grain.

[Namiki Satoru]

printing

When regularly distributed dots or lines, such as parallel thin lines, are overlapped, various patterns can be created depending on the angle at which they are overlapped. When printing with multi-color halftone screens, if the screen angle of each screen is incorrect, moiré will occur and the image will look unnatural.

[Fumio Hiraishi]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

目の粗い二枚の織物を重ね透かして見ると、重なり方によっては、波形模様（木目(もくめ)模様）が見られる。これは二枚の織り目の糸密度から生ずる、光の干渉によって生まれるもので、カーテンなどでよく見受ける。このモアレ模様を織物加工に施したものがあり、〔1〕横畝(よこあぜ)織物二枚を重ね合わせ、熱圧縮ローラー間を通して型付けする方法と、〔2〕木目を彫った熱圧縮ローラーで押型加工してつくられるものがある。

［並木　覚］