This is the 14136th most frequent Russian word.
описанных
"Described."
The word 'описанных' is used as a past passive participle modifying the noun 'исследованиях', meaning 'described' or 'mentioned'.
Эти книги содержат примеры, базирующиеся на ранее описанных исследованиях.
These books contain examples based on previously described studies.
Here, 'описанных' serves as a participle agreeing with 'процедур' to refer to those procedures that have been described.
В статье представлены данные, взятые из описанных экспериментальных процедур.
The article presents data extracted from the described experimental procedures.
In this example, 'описанных' modifies 'фактах', referring to facts that have been described in the report.