Neth"er (n&ebreve;&thlig;"&etilde;r), a. [OE. nethere, neithere, AS. niðera, fr. the adv. niðer downward; akin to neoðan below, beneath, D. neder down, G. nieder, Sw. nedre below, nether, a. & adv., and also to Skr. ni down. √201. Cf. Beneath.] Situated down or below; lying beneath, or in the lower part; having a lower position; belonging to the region below; lower; under; -- opposed to upper.

'Twixt upper, nether, and surrounding fires.

This darksome nether world her light
Doth dim with horror and deformity.

All my nether shape thus grew transformed.

• lower; under
  
• lying or conceived as lying beneath the earth's surface: