No. 8,945 in Russian
рудн
It seems "рудн" may be a fragment or a typo. If you mean "РУДН," it refers to the "Peoples' Friendship University of Russia" (Российский университет дружбы народов).
In a sentence
Когда он упал на камни, он почувствовал рудную боль.
When he fell on the rocks, he felt an ore-like pain.
The term 'рудная' in this context refers metaphorically to 'rudn' (ore) to describe the heavy and raw sensation of pain, drawing a poetic representation.
Девушка изучает геологию и интересуется рудными месторождениями.
The girl studies geology and is interested in ore deposits.
Here, 'рудные месторождения' clearly refers to geological ore deposits, denoting materials mined for metals.
Её глаза блестели как рудный минерал на солнце.
Her eyes shone like an ore mineral in the sun.
This analogy uses 'рудный' (ore-like) to poetically describe the brightness of the eyes, comparing it to the shine of an ore mineral.
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