غَسَقٌ

The beginning of the darkness of night: (Fr, S, O:) or the darkness of the night: (Akh, TA:) or the darkness of the beginning of the night: (K:) or [the time] when the شَفَق [or redness in the horizon after sunset] disappears: or the time of the blending of the عِشَاانِ, [see رُوَان, last sentence,] which is when the darkness becomes confused, and obstructs [the view of] the aspects of things: or, according to Sh, the entering-in of the beginning of the darkness. (TA.)

Also Refuse that is found among wheat, such as رُوَان [or darnel-grass, &c.], and the like. (Fr, O, K.)