Etymology debatable: borrowed into MLat. from some other Indo-European language: (i) according to NEI, DCVB, <- Gaul. *blāto 'fruit' < PCelt. *blātu- ‘flower’ < PIE *bhleh₃-tu- 'blossoming' < *bhleh₃- 'blossom, flower'; or (ii) according to TLF, <- PGm. *blada- n. ‘leaf, blade’ < PGm. *blōan- v. 'to bloom'. Further etymology: "quasi PIE *bhlh₁-tó-" (GK). TLF gives the etymology as follows: <- OFrk. *blād 'produce of the land' < IE *bhlē- 'flower, leaf; to flower'.
Buck, C., D. (1949). A dictionary of selected synonyms in the principal Indo–European languages: a contribution to the history of ideas. Chicago: University of Chicago Press.
Guus Kroonen. Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online.
Matasović, Ranko. Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill. Brill Online: http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/content/proto-celtic/index.html
Trésors de la langue francaise informatisées. Centre national de ressources techniques et lexiques. http://www.cnrtl.fr/definition/
Nocentini, Alberto (2010). L'etimologico: vocabolario della lingua italiana. 1. ed. Milano: Le Monnier
Robert Farren, PIE culture words collection, 2017
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