1. an overlying stratum or layer
Usage: geology
2. a language that influences another language through contact, typically the language of a dominant group
Usage: linguistics

Examples

• The limestone superstratum protected the softer rock beneath from erosion.
• Archaeologists carefully removed each superstratum to reach the ancient artifacts below.
• The volcanic ash formed a distinct superstratum in the geological record.
• French served as a superstratum language in medieval England after the Norman Conquest.
• The superstratum of clay made drilling through to the water table more difficult.
• Linguists studied how the colonial superstratum affected local vocabulary and grammar.