This is the 6716th most frequent Russian word.
rossa
"Rossa" in Russian means "dew."
In this sentence, 'росса' refers to 'ros' (dew), denoting the small droplets of water that form on grass and other surfaces early in the morning.
Утром на траве была росса.
In the morning, there was dew on the grass.
Here, 'Росса' is a proper noun, possibly the name of a village or a place.
Друзья отправились в деревню Росса для отдыха.
The friends went to the village of Ross for relaxation.
In this metaphorical usage, 'росса' signifies freshness or something reminiscent of dew in a non-literal sense.