This is the 16533rd most frequent Russian word.
сваренной
Boiled.
Here, 'сваренной' describes the state of the chicken after the action of boiling, specifying the method of its preparation.
Мама приготовила суп из сваренной курицы.
Mom made soup from boiled chicken.
In this sentence, 'сваренной' is used as an adjective derived from the verb 'сварить', modifying 'картошкой'.
Дети с удовольствием ели сваренной картошкой.
The children enjoyed eating boiled potatoes.
The usage of 'сваренной' here indicates the state of water as 'boiled', emphasizing preparation through boiling.