This is the 12915th most frequent Russian word.
лесотехнического
"Of forest engineering" or "relating to forest technology."
In this sentence, 'лесотехническом' is used as an adjective modifying 'университете' (university), specifying the type of university.
Я учусь в лесотехническом университете.
I study at the Forestry Technical University.
Here, 'лесотехническую' describes the exhibition, indicating its focus on forestry technology.
Мы посетили лесотехническую выставку.
We visited the forestry technical exhibition.
In this instance, 'лесотехнического' modifies 'института' (institute), denoting that the institute is related to forestry technology.