Boyd’s Bible Dictionary:
(thorn). Priest of 7th course (1 Chron. 24:10).
Concise Bible Dictionary:
The chief of the seventh course of priests (1 Chron. 24:10). Some priests are alluded to as the descendants of KOZ (the prefix being taken as the article) (Ezra 2:61; Neh. 3:4,21; Neh. 7:63). The RV has HAKKOZ in these passages.
Jackson’s Dictionary of Scripture Proper Names:
the thorn