English
endophallus
From endo- + phallus.
Today it means
noun The inner wall of the aedeagus of an insect, derived during embryological development by the fusion of paired genital papillae to form a medial tube. The endophallus is eversible and flexible, is the actual intromittent organ, and sometimes has backward-orientated denticulations to achieve a firm hold on the vaginal walls of the female.
Language periods are conventional ranges, not dates for this word.
Etymograph / endophallus