adverb, noun
about the middle; mid-
Used to refer to the approximate middle of a time period, such as a month, year, or era. Often used in expressions like 〜の中頃.
彼は八月の中頃に帰国する予定だ。
He plans to return to his country around the middle of August.
江戸時代の中頃に建てられた寺です。
It's a temple built around the middle of the Edo period.
Compound of 中 (naka, 'middle') and 頃 (koro, 'approximate time'). The reading なかごろ is a straightforward combination.