gentilicial adjective 1noun 1forms 3 adjective1 •Indicative of the family or lineage.Ingua was the Hereditary Name of the Kings Romans of Peru, and their Gentilicial Arms a Rainbow and Two Snakes — 1724 noun1 •A name or symbol that identifies a family or lineage.But Aurelius is a gentilicial name, like Propertius, and such duplication of gentilicials would be most extraordinary at this period. — 1977 formsgentilicials · more gentilicial · most gentilicial