An Etymological Dictionary of the German Language/Ader

by Friedrich Kluge

Ader, f., ‘vein,’ from MidHG. âder, OHG. âdara, f., ‘vein, sinew,’ corresponding to MidLG. ader, ‘vein, sinew,’ Du. ader, AS. œ̂dre, f., ‘vein’ (rarely êðr), OSw. aþra, ModSw. ådra; also without the deriv. r, OIc. œ̂ðr (the r is simply a nomin. suffix), f., ‘vein;’ the Goth. cognate êþ is not found. The pre-Teut. êt- has been connected with Gr. ἥτορ, ‘heart,’ ἦτρον, ‘abdomen,’ and here it must be recollected that MidHG. and MidLG. âder in the plur. may signify ‘bowels.’