what does wailer mean

The word "wailer" means a person who wails or laments, that is, someone who utters long, loud, high-pitched cries, typically expressing grief or sorrow. It can also refer to a professional hired mourner. Historically and in mining, it can mean a boy employed to pick out stones or pyrites from coal after screening. Essentially, a wailer is someone who cries out loudly in mourning or sorrow.