An Etymological Dictionary of the German Language/glühen
glühen, vb., ‘to glow,’ from the equiv. MidHG. glüen, glüejen, OHG. gluoen, wk. vb.; corresponding to AS. glôwan, E. to glow, Du. gloeijen, OIc. glóa, ‘to glow.’ From the Teut. root glô, glê, are also derived ModHG. Glut, MidHG. and OHG. gluot, f., to which Du. gloed, AS. gléd (Goth. *glô-di-), E. dial. gleed correspond, likewise AS. glôma, glômung, ‘twilight,’ E. gloom, OIc. glámr, ‘moon.’ With the Teut. root gló, glê (from pre-Teut. ghlū̆), Lith. zlejà, ‘twilight,’ is also connected.