Middle Ten Days Of The Month, Middle Of The Month
noun
The middle ten days is the middle ten days of the month. You could also call this the middle of the month.
ちゅうじゅん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
予定日は十一月の中旬です。
My due day is around the middle of November.