GPC, PGm. *smerwa- n. ‘butter, grease’ < proto-form. *smer-u- (GK): "West-European... A wa-stem to the root * smer-. Cf. also ON smyrva, smyrja, OE smierwan, Du. smeren, OHG smirwen, G schmieren wv. 'to smear, to anoint' < *smerwjan-" (GK). Guus Kroonen. "smerwa-" in: Etymological Dictionary of Proto-Germanic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill, 2014. Brill Online. June 13, 2014. < http://iedo.brillonline.nl/dictionaries/lemma.html?id=22457 >
Robert Farren, PIE culture words collection, 2017
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