This is the 641st most frequent Serbian word.
осталих
"Осталих" means "of the others" or "of the remaining" in English.
Here, 'осталих' is used in the genitive plural to refer to the remaining students who are part of a larger group.
Подељено је међу осталих седам ученика.
It was distributed among the other seven students.
Here, 'осталих' refers to 'the remaining/other words' out of an implied list or group of words previously mentioned or considered.
Осталих речи се није сећао.
He did not remember the rest of the words.
Here, 'осталих' is used to indicate 'the rest/remaining of a specific group', in this case, five family members apart from those already mentioned.