殴 is built from the 区 and 殳 (weapon / strike) components.
It reads オウ like 区, as do 欧 — learn 区 once and the family's reading comes with it.
A common word using 殴 is 殴る (なぐる), meaning “to strike; to hit; to punch”.
Kanji that look similar include 枢 and 欧.
