rouille
UK[ˈruːi]US[ruːˈi]
n
A sauce, typically served with fish, made from olive oil, garlic, chili peppers, and sometimes saffron or breadcrumbs, originating from Provence in France.
n
(Literally "rust" in French) The reddish-brown color of iron oxide.
Etymology
The English culinary term 'rouille' is a direct borrowing from Modern French, where it literally means "rust," referring to the sauce's characteristic rust-red color derived from chili peppers and sometimes saffron. The French word 'rouille' itself descends from the Old French 'roille,' meaning "rust" or "filth," which in turn originates from the Latin 'rōbīgō' or 'rūbīgō,' meaning "rust" or "mildew." This Latin term is derived from 'rōbus' or 'rūfus,' meaning "red," a root that connects to the Proto-Indo-European h₁rewdʰ-, meaning "red" or "ruddy," which is also the source for English words like "red" and "ruby." The semantic journey from the color "red" to "rust" and finally to the name of a reddish sauce is a clear example of a loanword retaining its vivid descriptive logic.
Analysis
The word is a direct loanword from French. It is not productively segmented into meaningful morphemes within the English spelling system.
Examples
The chef garnished the bouillabaisse with a dollop of spicy rouille.
The classic recipe for rouille includes garlic, chili, and olive oil pounded into a paste.
The color of the old pipe was a deep rouille, flaking at the edges.