A back vowel is a sound where the back of the tongue approaches the palate.

Back vowels are vowels that are pronounced using the back of the tongue.

In Japanese grammar, postpositions play an important role.

Postfix notation is one method of expressing calculations.

Polyandry is a social system where one woman marries multiple men.

He started a special exercise to train his serratus posterior inferior muscle.

By strengthening the posterior scalene muscle, you can reduce neck and shoulder pain.

He is doing a special exercise to train his occipitofrontalis muscle.

Kujō Yoshitsune, the former Prime Minister and Regent of the Go-Kyogoku, played an important role in Japanese history.

He is suffering from post-traumatic stress disorder from the war.