Canteen
mid 18th century (originally denoting a shop selling provisions or alcohol in a barracks or garrison town): from French cantine, from Italian cantina ‘cellar’. A French use of cantine denoting a small compartmented case for carrying bottles of wine may have given rise to canteen (sense 3).
wiktionary
From French cantine, from Italian cantina, from Vulgar Latin canthus(“corner”), from Gaulish *cantos, denoting the location for liquor storage, from Proto-Celtic *cantos(“corner”), from Proto-Indo-European *kh₂ndʰ-. Doublet of cantina.
etymonline
canteen (n.)
1744 (in a recollection from c. 1710), "store in a military camp," from French cantine "sutler's shop" (17c.), from Italian cantina "wine cellar, vault," diminutive of canto "a side, corner, angle." Thus it is perhaps another descendant of the many meanings that were attached to Latin canto "corner;" in this case, perhaps "corner for storage." A Gaulish origin also has been proposed.
Sense of "refreshment room at a military base" (1803) was extended to schools, etc. by 1870. Meaning "small tin for water or liquor, carried by soldiers on the march, campers, etc." is from 1744, from a sense in French.
