This is the 18117th most frequent Russian word.
холодном
"Холодном" is the prepositional case form of "холодный," meaning "cold" in English.
The word 'холодном' is used as an adjective and agrees in gender, number, and case with the noun 'воздухе'.
В холодном воздухе ощущался аромат снега.
In the cold air, the scent of snow was felt.
The word 'холодном' is again an adjective modifying 'уголке', demonstrating its agreement in the dative case.
Она сидела в холодном уголке комнаты, завернувшись в плед.
She sat in the cold corner of the room, wrapped in a blanket.
Here, 'холодном' is related to 'полу', in the prepositional case, showing its role in describing characteristics.