Etymology
From Middle English mistelto, mistilto (“European mistletoe”), from Old English misteltān (“mistletoe”), from mistel (“mistletoe; basil; birdlime”) + tān (“sprig, shoot, twig”), possibly as a calque of Old Norse mistilteinn; equivalent to mistle + tan (“twig”). This was mistaken for the plural of tā (“toe”).
Cognate with Danish mistelten (“mistletoe”), Norwegian misteltein (“mistletoe”), Icelandic mistilteinn (“mistletoe”). Compare also the simplex form West Frisian mistel (“mistletoe”), Dutch mistel (“mistletoe”), German Mistel (“mistletoe”), Swedish mistel (“mistletoe”).