penis
/ˈpiːnɪs/noun
(pl. penises 或penes /-niːz/)
1- the male genital organ of higher vertebrates, carrying the duct for the transfer of sperm during copulation. In humans and most other mammals it consists largely of erectile tissue and serves also for the elimination of urine.（高等脊椎动物的）阴茎。
1.1
- Zoology a type of male copulatory organ present in some invertebrates, such as gastropod molluscs【动】（无脊椎动物的）雄性交尾器官。
词源
late 17th cent.: from Latin, 'tail, penis'.