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From Biology-Online Dictionary
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1. Covered or affected with rust; as, a rusty knife or sword; rusty wheat.

2. Impaired by inaction, disuse, or neglect. [Hector] in this dull and long-continued truce, Is rusty grown. (Shak)

3. Discoloured and rancid; reasty; as, rusty bacon.

4. Surly; morose; crusty; sullen. Rusty words.

5. Rust-coloured; dark. Rusty blood.

6. Discoloured; stained; not cleanly kept; filthy. The rustly little schooners that bring fire wood from the Brititsh provinces. (Hawthorne)

7. (Science: botany) Resembling, or covered with a substance resembling, rust; affected with rust; rubiginous.

Origin: Rustier; Rustiest.