This is the 14938th most frequent Polish word.
roju
"Roju" is the locative or dative form of "rój," meaning "swarm" (e.g., of bees) in Polish.
The word 'roju' refers to the possessive context of a swarm, used in the genitive case, indicating ownership or association to the bees.
W lesie zauważyłem niezwykłe zachowanie roju pszczół.
In the forest, I noticed the unusual behavior of a swarm of bees.
Here, 'roju' denotes the genitive singular form of 'swarm,' referring to a group of insects and indicates the direction or relation to the swarm.
Boimy się zbliżać do roju owadów, aby uniknąć użądlenia.
We are afraid to approach the swarm of insects to avoid being stung.
In this sentence, 'roju' metaphorically applies to a cluster of stars, expressing visual resemblance or poetical imagery, again in the genitive singular form.