Ghostly Greetings is a term used to describe a friendly greeting from a ghost. It is often used in Halloween-themed activities and decorations, as well as in literature and films. The term can also be used to describe a feeling of being welcomed by a spirit or other supernatural being. The crossword solution for Ghostly Greetings is 'BOOS', which is a play on the word 'BOO' which is a common way to express surprise or fright.