How many letters does the top answer for “having the appearance or color of iron rust; rusty-looking.” have?

The most common answer is rubiginose (10 letters).

Crossword clue: having the appearance or color of iron rust; rusty-looking.

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

rubiginose 10 letters web-def

Having the appearance or color of iron rust; rusty-looking.

rubiginous 10 letters web-def

Having the appearance or color of iron rust; rusty-looking.

having the color or properties of the rust of iron. 50% similar → ferruginated