/ ˈmɪsltəʊ; ˈmɪzl-; NAmE -toʊ/ noun
[ U ] a plant with small shiny white berries that grows on other trees and is often used as a decoration at Christmas :
the tradition of kissing under the mistletoe
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WORD ORIGIN
Old English misteltān , from mistel mistletoe (of Germanic origin, related to Dutch mistel and German Mistel ) + tān twig .