D defs.my
Entry 1 sense Webster, 1913

Lethean

/(lē̇*thē"an)/ · Le·the·an · IPA /liːˈθi.ən/
01 a. Of or pertaining to Lethe; resembling in effect the water of Lethe.
  1. 1.
    Of or pertaining to Lethe; resembling in effect the water of Lethe.