An Etymological Dictionary of the German Language/Heidelbeere
Heidelbeere, f., ‘bilberry, whortleberry,’ from MidHG. heidelbęr, heitbęr, n. and f., OHG. heidbęri, n., ‘bilberry, whortleberry’; corresponds to AS. hœ̂ð-bęrie, with the same meaning. Allied to Heide, f.