This is the 2643rd most frequent French word.
romain
"Romain" in English means "Roman."
Here, 'romaines' is an adjective describing 'ruines' (ruins), indicating that they are associated with Rome or the Roman Empire.
Les ruines romaines témoignent de la grandeur de l'Antiquité.
Roman ruins testify to the grandeur of antiquity.
In this sentence, 'romain' serves as an adjective for 'style', specifying that the style pertains to Rome or is characteristic of Roman design.
Le style romain de l'architecture est très influent en Europe.
The Roman style of architecture is very influential in Europe.
Here, 'romain' is used as a noun, referring to a person from Rome, and is singular in form.