This is the 4789th most frequent Portuguese word.
estufa
Greenhouse.
Here, 'estufa' refers to a structure (greenhouse) used in horticulture to create a controlled environment for plant growth.
A estufa ajuda a proteger as plantas contra o frio.
The greenhouse helps protect the plants from the cold.
In this context, 'estufa' means a warming oven or a device to keep food warm.
Ela deixou a comida na estufa para mantê-la quente.
She left the food in the warming oven to keep it hot.
'Estufa' is part of the term 'gás de efeito estufa,' which means 'greenhouse gas,' referring to gases that contribute to the greenhouse effect resulting in global warming.