一切經音義 27.304

27.304

宅主（玉篇主親也典領也天子嫁女同姓諸侯主之故謂公主又守也）。

宅主 (Master of the house; the Yupian says: "Master (zhǔ) means close kin; it also means to manage and supervise. When the Son of Heaven gave his daughter in marriage, a feudal lord of the same surname presided over it (zhǔ zhī), hence she was called a gōngzhǔ (princess)." It also means to guard).