Hai·nan 
(hīnän)
(hīnän) An island of southern China in the South China Sea, separated from Leizhou Peninsula by a narrow strait. It constitutes China's smallest province.
- off the top of (one's) head
- off the top of one's head
- off the wagon
- off-the-wall
- off the wall
- off the wind
- off-track
- off-track betting
- off-white
- off year
- O'Flaherty
- of late
- ofloxacin
- OFM
- of necessity
- of (one's) word
- of one's word
- of sorts/a sort
- of sorts sort
- oft
- often
- oftentimes
- of the deepest dye
- of the essence
- ofttimes