The absolute form given here is based on the etymology from ḥdt as suggested by LS and NSG section 26B. The JBA spelling, however, suggests rather a (folk?) etymology from ḥdy.
In Mandaic, the singular hiduta seems to be both "bride" and "groom". In the plural there is a clear distinction: hidutia are "grooms" and hidutata or hidutiniata are "brides".
Perhaps, though, actually from Akkadian ḫidûtu, "joy".