noun
glans penis; head of the penis
Anatomical term for the glans; sense 3 is an archaic synonym for the same body part. In modern usage, 雁首 (かりくび) is the common colloquial term, while medical contexts may use 亀頭 (きとう).
雁首の形には個人差がある。
The shape of the glans varies from person to person.
包茎手術では雁首を露出させる。
In phimosis surgery, the glans is exposed.
noun
gooseneck shape; something shaped like a goose's neck
Archaic use for any object with a curved, gooseneck-like shape, such as a pipe or tool. Not used in modern everyday speech.
昔のパイプは雁首が長く曲がっていた。
Old pipes had a long, curved gooseneck.
Medical/anatomical term for glans penis; more formal than 雁首.
Literally 'goose neck', from the resemblance of the glans to a goose's curved neck. The reading かりくび is a compound of 雁 (かり, 'wild goose') and 首 (くび, 'neck').