English

adusk

From a- (“on, at”) + dusk.

Formed from a- ‘on, at’ + dusk

Proto-Indo-European *uds- ‘up, out’

Proto-Germanic *uz- ‘out-’

Proto-West Germanic *uʀ- ‘up, out, over’

English a-

Proto-Indo-European *dʰwes- ‘to smoke, fume’

Proto-Germanic *duskaz ‘dark, smoky’

Old English dox ‘dark, swarthy’

Middle English dosk ‘dusky’

English dusk

Today it means

adv At dusk; in the dusk or twilight.

Language periods are conventional ranges, not dates for this word.