tenebra
From LSJ
ἐκ Χάεος δ' Ἔρεβός τε μέλαινά τε Νὺξ ἐγένοντο... (Hesiod's Theogony 123) → From Chasm, Erebos and black Night came to be...
tenebra, s. tenebrae.
tenebra tenebrae N F :: darkness (pl.), obscurity; night; dark corner; ignorance; concealment; gloom