What is chrysalid?

As an AI language model, I assume you are referring to the Chrysalids, which is a science fiction novel by John Wyndham. It was first published in 1955 and is set in a post-apocalyptic world where mutants are persecuted by society. The story follows a group of telepathic children, led by a boy named David, who must try to survive in a society that sees them as abominations. The title of the book refers to the chrysalis stage of insects, where they undergo a metamorphosis before emerging as something new. In the book, the children are also going through a metamorphosis as they learn to control their powers and adapt to their hostile environment.