PCelt. *gayso- ’spear’ < PIE. *ǵhoyso- 'spear' (IEW: 410) / PGm. *gaiza- m. ‘spear, tip’ < proto-form. *ghois-ó- / ON geirr m. 'id.', Nw. geir m. 'leister, eel spear; small tip; ness, headland; small mackerel', OE gār m. 'id.', OFri. gēr-, OS gēr m. 'id.', MDu. geer m. 'id.', OHG gēr m. 'id.', MHG gēr m. 'id.' / OIr. gae m., MW gwaew m./f. 'spear' < *ghaiso-. / "A Germanic-Celtic isogloss; there is some evidence that the Celtic word was borrowed from Germanic" (GK). ”Since the Celtic words for 'spear' imply a proto-form with *ay rather than *oy, PCelt. *gayso- may be a loanword from Germanic, cf. Delamarre 174. PIE *ǵhoyso- 'spear' is probably derived from the root *ǵheys- 'wound' (Skt. hinásti 'wounds', with the nasal infix in the present stem). Another possibility is to compare Skt. hetí- 'missile', Av. zaēna- 'weapon' and derive PIE *ǵhoy-so- from the root *ǵhey- v. 'to impel' (RM). Ranko Matasović. "gayso-" in: Etymological Dictionary of Proto-Celtic. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill, 2015. Brill Online. February 21, 2015. < http://iedo.brillonline.nl.ludwig.lub.lu.se/dictionaries/lemma.html?id=16500 >
Robert Farren, PIE culture words collection, 2017
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