The term "velum" refers to a membrane or thin layer of tissue found in various organisms. In human anatomy, it often describes the soft palate, which separates the oral cavity from the nasal cavity and plays a crucial role in speech and swallowing. In other contexts, such as in biology, the velum can refer to structures in certain animals, like the mollusks or jellyfish, where it serves different functions, including aiding in movement or providing support. The specific characteristics and roles of the velum can vary significantly across different species.