dealanach

dealan, dealanach

lightning, Irish dealán, spark, flaming coal, *dilo-: root di, dei (dêi), deya (Fick), shine; Greek $$Gdéelos (= $$Gdéj-elos), conspicuous, $$Gdc$$nlos, clear; Sanskrit dî, shine; further is *dei-vo-s, whence Gaelic dia, etc. Middle Irish tene-gelain, "lightning", now "will o' the wisp"; tene-gelan, fireflaught.