I / interfĕmĭnĭum
noun

interfĕmĭnĭum

gen. interfĕmĭnii · gender neuter · decl. 2nd

Full Article

interfĕmĭnĭum, ii, n. inter-femen, i. q. cunnus (post-class.), App. Mag. p. 296, 15 and 22.