adult worm costume

AOL: From a worm to an army of clones, Heidi Klum’s most iconic Halloween costumes From a worm to an army of clones, Heidi Klum’s most iconic Halloween costumes The Hollywood Reporter: Heidi Klum’s Worm Costume: Everything You Wanted to Know But Were Afraid to Ask Heidi Klum’s Worm Costume: Everything You Wanted to Know But Were Afraid to Ask Cinema Blend: Why Heidi Klum Puts So Much Effort Into Her Halloween Costumes After Dressing As A Worm And More Over The Years

"Adult children" comes from "adult children of alcoholics", but now has broader reference to adults who were abused emotionally, physically or sexually in childhood. Merriam-Webster has an entry for half-orphan, meaning someone with only one living parent. They say specifically a child, which would match the usual usage of "orphan" (as mentioned in the question), but it might be used of an adult sometimes, either jocularly or by extension. This doesn't distinguish which parent is dead, but could be combined with a further explanation if it matters.