शिश्नśiśnam. n. (cf. शिशन्; said to be fr. √श्नथ्, "to pierce") a tail, (esp.) the male generative organ RV. &c. &c.
masculine gender neuter gender (confer, compare शिशन्; said to be from √श्नथ्, "to pierce") a tail, (especially) the male generative organ fg-veda etc. etc.