Meaning and case of обиженных

Question

I can't find any information about this word on wiktionary.

Example sentence: Он стал на защиту обиженных.

Answer 1

Case is genitive (родительный падеж): стал на защиту кого?

обиженные means oppressed, disadvantaged (people), it is in plural form. Singular masculine would be обиженный.