noun, verb ·2 syllables ·Rare ·Advanced level

Definitions

Noun

1. 1
   The development of rust on a surface.

   "An example will best make the matter clear, and throw light, perhaps, on many cases of apparently mysterious rustings."

2. 2
   the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water wordnet
3. 3
   The phenomenon where the fur of a black cat develops a brown colour when exposed to sunlight.

Verb

1. 1
   present participle and gerund of rust form-of, gerund, participle, present

Synonyms

All synonyms

rustrust

Example

More examples

"Activity keeps the mind from rusting."

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.