"War orphans" refers to children who have lost one or both of their parents due to a war. These kids have no one to take care of them or provide for them because their parents died in the conflict. Full definition
By introducing the twins Quicksilver and Scarlet Witch (Aaron Taylor - Johnson and Elizabeth Olsen), war orphans who have almost become nihilists, Whedon turns up the angst. (charlotteobserver.com)
Another landmark set of studies regarding the fates of British war orphans led him to conclude that infants raised in institutions without stable and continuous relationships with caregiving adults grew up with deficits in cognition, language, attention, and the capacity for durable interpersonal relationships. (advokids.org)
I recently just finished reading Michaela DePrince's memoir «Taking Flight: From War Orphan to Star Ballerina,» (see review here) and Keep Reading (thevintageandvinelifestyle.com)