Easton's Bible Dictionary (1897)
Thorn. (1.) A descendant of Judah. 1 Chr. 4:8, “Coz;” R.V., “Hakkoz.” (2.) A priest, the head of the seventh division of the priests (Ezra 2:61; Neh. 3:4, 21; 7:63). In 1 Chr. 24:10 the word has the article prefixed, and it is taken as a part of the word “Hakkoz.”
Smith's Bible Dictionary (1863)
(thorn), (Ezra 2:61; Nehemiah 3:4,21) = Coz = Hakkoz.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
KOZ (thorn). A descendant of Judah. 1 Chr 4:8. See Coz. A priest, head of one of the courses. 1 Chr 24:10. See Hakkoz. It was probably the descendants of this priest who could not find the record of their genealogy on the return from captivity, and were put from the priesthood. Ezr 2:61; Neh 7:63. Meremoth, of the family of Koz, repaired part of the wall. Neh 3:4, 2 Chr 11:21.