"inner surface" in German inner surface Innenfläche Innenseite Detailed translations for "inner surface" inner surface inner surface(also: interior surface) die Innenfläche{feminine} inner surface(also: inside, inner side) die Innenseite{feminine} It's on the inner surface of the upper thigh. Source: opensubtitles.org Corpus by OPUS Request review An der Innenseite des Oberschenkels.