labrusca

From the species epithet in Vitis labrusca, from Latin labrusca.

labrusca (plural labruscas)

1. The fox grape (Vitis labrusca).

• lambrusca (Late Latin)

Uncertain:

• if the first vowel was short, possibly a compound of labrum (“lip”) +‎ ūrō (“to burn”) +‎ -ca, in reference to its acidity - notice the substitution of the first member with lambō (“to lick”). This is supported by several ancient grammarians; other grammarians also refer it to labrum, but in the meaning “edge of the field” where it was usually found;
• if the first vowel was long, possibly from lābor (“to glide down”), but this leaves the second element unexplained.

Compare laburnum (“golden chain”) and rūscum (“butcher's broom”) for possible contamination sources.

• (Classical Latin) IPA^(key): [ɫaːˈbruːs.ka], [ɫaˈbruːs.ka]
• (modern Italianate Ecclesiastical) IPA^(key): [laˈbrus.ka]

lā̆brūsca f (genitive lā̆brūscae); first declension

1. the plant of the woodland grape (Vitis vinifera subsp. sylvestris)

First-declension noun.

• lā̆brūscum (“its fruit”)

Note that both elements are continued in two shapes: /la-/ vs /lam-/ and /ū/ vs. /u/; as well as in two genders.

• “labrusca” in the Thesaurus Linguae Latinae (TLL Open Access), Berlin (formerly Leipzig): De Gruyter (formerly Teubner), 1900–present

• “labrusca”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “labrusca”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• labrusca in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.