ἀμολγός

Etymology
The exact meaning had already been lost in antiquity. If a verbal noun of, it means "the milking" (and the oxytonesis is secondary). Nilsson took it as the time of milking at the beginning of the night. Several authors argue that the word indicates the "evening twilight", and adduce parallels from other languages for an original meaning "night milking". Still, if (a gloss found in Hesychius) points to, the alternation ἀ-/ὀ- could point to a  word.

Noun

 * 1)  depth, gloom of night
 * 2) evening or morning twilight