The glans penis (or just glans) is the sensitive tip of the penis. It is also called the "head" of the penis. Slang names include "helmet" and "bell end". Usually, the glans is covered by the foreskin, except in men who have been circumcised.
The opening of the urethra is at the tip of the glans. In children who have been circumcised and wear diapers, the opening of the penis has no protection. This can cause the urethra to get very narrow in a small amount of boys which can need surgery to reopen later.
- OED 2nd edition, 1989.
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