"Cerrado" can have different meanings:
* In Spanish: It means "closed" or "shut." The opposite would be "abierto" (open).
* As a biome: It refers to a type of tropical savanna ecosystem in Brazil. In this context, it wouldn't have a direct opposite in terms of an ecosystem type. However, you could say tropical rainforest or tropical deciduous forest are contrasting biomes.
* As a term for a type of group: It can mean a "closed group" or a "clique." The opposite would be "open" or "inclusive".
To give you a more precise answer, please provide the context in which you encountered the word "cerrado."