<p><strong>Noun</strong></p><ul><li>sub·stra·ta</li><li>something that is spread or laid under something else</li><li>a stratum or layer lying under another</li><li>something that underlies or serves as a basis or foundation</li><li>the subsoil</li><li>the base or material on which a nonmotile organism lives or grows</li><li>substance, considered as that which supports accidents or attributes</li><li>a layer of material placed directly on a film or plate as a foundation for the sensitive emulsion</li><li>a set of features of a language traceable to the influence of an earlier language that it has replaced</li></ul><p><strong>Plural Noun</strong></p><ul><li>sub·stra·tums</li></ul>