/ʁuj/
rust (color/colour)
Inherited from Old French reoïlle, from Vulgar Latin *robicla, from syncopation of Latin *robicula, a diminutive of Latin rōbīgō (“rust”) + -cula (from -culus (suffix forming diminutives)). Rōbīgō is derived from rōbus (a variant of rūfus (“red, reddish”)) + -īgō (suffix forming nouns usually denoting diseased conditions). Compare Catalan rovell, Occitan rovilh, Spanish robín.
rust (oxidation of iron or, by extension, other metals); rust (fungus disease of plants); rouille (provençal sauce made with chilli and garlic)
“Le vert-de-gris est la rouille du cuivre.” — Verdigris is copper rust.
Inherited from Old French reoïlle, from Vulgar Latin *robicla, from syncopation of Latin *robicula, a diminutive of Latin rōbīgō (“rust”) + -cula (from -culus (suffix forming diminutives)). Rōbīgō is derived from rōbus (a variant of rūfus (“red, reddish”)) + -īgō (suffix forming nouns usually denoting diseased conditions). Compare Catalan rovell, Occitan rovilh, Spanish robín.