續一切經音義 2.10

2.10

牕牖（上楚江反說文云在牆曰牖在屋曰牕從片悤聲像交眼之形經作牎或作窗皆俗字下由酒反說文云穿壁以木交為窗也從片戶甫聲也悤音同上）。

Windows (牕牖) (The first [character] has the fanqie chǔ + jiāng [chuāng]. The Shuowen states: 'On a wall it is called a yǒu; in a house it is called a chuāng. It derives from split-wood (片) with the phonetic cōng (悤), resembling the shape of criss-cross lattice openings.' In the sūtra it is written as 牎 or as 窗, both being popular characters. The second [character] has the fanqie yóu + jiǔ [yǒu]. The Shuowen states: 'Piercing a wall with interwoven wood to make a window. It derives from split-wood (片), door (戶), with the phonetic fǔ (甫).' 悤 has the same pronunciation as above).