Wiktionary
n. (context anatomy English) A conical vascularized body forming the extremity of the penis.
WordNet
n. the conical mass of erectile tissue that forms the head of the penis
Wikipedia
In male human anatomy, the glans penis (or simply glans, ) is the sensitive bulbous structure at the distal end of the penis. The glans is anatomically homologous to the clitoral glans of the human female.
Typically, the glans is completely or partially covered by the foreskin, except in men who have been circumcised. The foreskin can generally be retracted over and past the glans, and may automatically retract during an erection.
The glans is more commonly known as the "head" or the "tip" of the penis. The medical name comes from the Latin words glans ('acorn') and penis ('of the penis') – the Latin genitive of this word has the same form as the nominative.