Origin: before 1000; Middle English mistelto, apparently back formation from Old English misteltān (mistel mistletoe, basil + tān twig), the -n being taken as plural ending; cognate with Old Norse mistilteinn
a Eurasian evergreen shrub, Viscum album, with leathery leaves, yellowish flowers, and waxy white berries: grows as a partial parasite on various trees: used as a Christmas decoration: family Viscaceae
2.
any of several similar and related American plants in the families Loranthaceae or Viscaceae, esp Phoradendron flavescens
3.
mistletoe cactus an epiphytic cactus, Rhipsalis cassytha, that grows in tropical America
[Old English misteltān, from mistel mistletoe + tān twig; related to Old Norse mistilteinn]
O.E. mistiltan, from mistel "mistletoe" (see missel) + tan "twig." Venerated by the Druids; the custom of hanging it at Christmas and kissing under it is mentioned by Washington Irving.