nether
adj.adj. the lower part of something, especially the part that is underground or hidden. You might use this to describe the deep parts of a mine or a cave.
adj. the lower or more remote part of something, particularly in a geological or architectural context. Often used in the phrase 'nether regions' to refer to the lower body or the depths of the earth.
The miners explored the nether parts of the cave.
Geologists studied the nether layers of the earth to understand the movement of tectonic plates.
The ancient builders constructed their temple on the nether slopes of the mountain, ensuring that the structure remained hidden from view by the surrounding forest.
From Middle English nether, nethere, nithere, from Old English niþera (“lower, under, lowest”, adjective), from niþer, niþor (“below, beneath, down, downwards, lower, in an inferior position”, adverb), from Proto-West Germanic niþer, from Proto-Germanic niþer, niþra (“down”), from Proto-Indo-European ni-, *nei- (“in, down”). Cognates include Dutch neder, German nieder, Luxembourgish nidder, Danish, Norwegian and Swedish ned, Danish, Norwegian and Swedish nedre (“lower”), Faroese and Icelandic niður.
Alteration of earlier nither, from Middle English nitheren, from Old English niþerian (“to depress, abase, bring low, humiliate, oppress, accuse, condemn”), from niþer (“below, beneath, down, downwards, lower, in an inferior position”). See above.