English
pruno
From prune + -o.
Formed from prune + -o
Ancient Greek προῦμνον ‘plum’
…
Latin prūnum
Vulgar Latin *prūna ‘a burning coal, live coal, glowing charcoal’
Old French prune ‘plum (fruit)’
Middle English prune ‘a plum’
English prune
The story
Originally (by 1940s) referring to fermented prune juice, later applied to any fermented fruit juice.
Today it means
noun An improvised alcoholic drink typically produced in correctional facilities.
Sources
Sources: Wiktionary, “pruno”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / pruno