PC

*ḥallān- - window (Greenfield 1969: 98, Ginsberg 1970: 103, Kogan 2015: 294)

The presence of ḥ in the Ugaritic form makes unlikely the traditional identification with *ḫll ‘to bore, to pierce’

Ugaritic
ḥln - window (DUL 361)
Hebrew
ḥallōn - window (HALOT 320)