mis ‧ tle ‧ toe /ˈmɪs ə ltəʊ $ -toʊ/ BrE AmE noun [uncountable]
[ Language: Old English ; Origin: misteltan , from mistel 'mistletoe' + tan 'small stem' ]
a plant with small white berries, which grows on trees. It is traditional to kiss people under a piece of mistletoe at Christmas.