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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.