This is the 11673rd most frequent Portuguese word.
petroleiro
"Petroleiro" in English means "oil tanker" (a ship) or "oil worker."
Here, 'petroleiro' describes a worker in the oil industry, particularly one involved in tasks related to petroleum extraction or handling.
Meu tio é um petroleiro que trabalha em plataformas no mar.
My uncle is an oil industry worker who works on offshore platforms.
In this example, 'petroleira' refers to historical aspects related to petroleum, using a derived form to tie it to the region's industry.
Há um museu dedicado à história petroleira da região.
There is a museum dedicated to the petroleum history of the region.
In this sentence, 'petroleiro' refers to an oil tanker, which is a ship designed for transporting petroleum.