What links the Italian word zaino (rucksack, backpack) with the English word mistletoe? Let’s find out.
Zaino [ˈdzaj.no] means rucksack, backpack, sack or bag in Italian [source]. It comes from Lombardic *zainjā (basket), from Old High German zeina (basket), from Proto-Germanic *tainijǭ (wickerwork, wicker basket), from *tainaz (rod, twig), the origins of which are unknown [source].
Words from the same roots include teen (twig, thin branch) in Dutch, Zain (rod, branch, whip) in German, tein (twig, offshoot, spindle) in Norwegian, ten (small stick or rod) in Swedish, and zana (a shallow, oval basket) in Italian [source].
Misletoe (a parasitic evergreen plant with white berries which grows on oaks, apple and other trees* – see above) comes from Middle English mistelto, mistilto (misletoe), from Old English misteltān, misteltān (misletoe), from mistel (mistletoe, basil, birdlime) + tān (twig, branch) [source].
*This refers to European misletoe,Viscum album. Other varieties of mistletoe are available [source].
Mistel comes from Proto-West Germanic *mistil (mistletoe), from Proto-Germanic *mistilaz (mistletoe), from Proto-Indo-European *me (with, mid) + *sed- (to sit) + *-ilaz (diminutive suffix), so mistletoe is a little plant that sits on other plants – a good description. The English word mistle, as in mistle thrush (Turdus viscivorus – see below), comes from the same roots, and used to be used to mean misletoe [source].
The Old English word tān (twig, branch) comes from Proto-Germanic *tainaz (rod, twig) [source], like the Italian word zaino, so there we have our connection. In Lancashire dialect, a tan used to refer to a twig or branch [source].
Incidentally, mistletoe in Italian is vischio [vi.skjo], which comes from Vulgar Latin *visclum, from Latin viscum (mistletoe, birdlime), the origins of which are uncertain [source]. The Portuguese word visgo (viscosity, any viscous substance secreted by or extracted from plants, mistletoe) comes from the same roots [source], as do viscous, viscose and viscosity in English [source]