氏族 is read as しぞく (shizoku) and means clan.
しぞく
shizoku
しぞくせいど
family or clan system
しめい
(full) name
うじがみ
patron god
し
clan
うじこ
shrine parishioner
うじびと
lineal descendant
うじのかみ
head of a clan
うじ
しぬ
to die
しのいけん
his opinion
うじこそうだい
parishioner representative
うじぶみ
ancient clan record (incl. their origins, their achievements, etc.)