An infix is a morpheme that is inserted inside a word.

A central vowel is a vowel that is pronounced in the central part of the tongue.

The central vowels in Japanese are 'a', 'e', 'o'.

He often behaves strangely because of his 'chuunibyou' (middle-school 2nd year syndrome).

He is showing behavior characterized by 'chuunibyou'.

He started exercises to strengthen his gluteus medius muscle.

The whimbrel is a bird often seen on the coast.

The whimbrel is a bird often seen on the coast.

He continued to write that report all night.

He bought a new fedora.