From Middle English thred, þred, threed, from Old English þrǣd, from Proto-Germanic þrēduz, from Proto-Indo-European treh₁-tu-s, from *terh₁- (“rub, twist”). Cognate with Saterland Frisian Träid (“thread, wire”), West Frisian tried, Dutch draad, German Draht, Norwegian, Danish and Swedish tråd, and Icelandic þráður. Non-Germanic cognates include Albanian dredh (“twist, turn”). More at throw.