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From Proto-Indo-European*leb-(“to hang loosely”),[1] making it cognate with Proto-Germanic*lepô(“lip”), although (as with many other roots reconstructed with *b) there is some doubt about whether this root goes back to Proto-Indo-European.[2][3]Lab- may be the regular outcome of zero-grade tautosyllabic *l̥b.-.[4]Doublet of labrum.
^ Olander, Thomas (2020) “To *b or Not to *b: Proto-Indo-European *b in a Phylogenetic Perspective”, in Historische Sprachforschung / Historical Linguistics, volume 133
^ Sihler, Andrew L. (1995) New Comparative Grammar of Greek and Latin, Oxford, New York: Oxford University Press, →ISBN, page 146
^ De Vaan, Michiel (2008) “labium”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 319
^ Schrijver, Peter C. H. (1991) The reflexes of the Proto-Indo-European laryngeals in Latin (Leiden studies in Indo-European; 2), Amsterdam, Atlanta: Rodopi, →ISBN, page 483
Further reading
“labium”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“labium”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
"labium", in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
labium in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.