Список префиксов, начинающихся на букву O:
| o o - o | om oman - omri |
| o- o-ring - o-rings | on on - onyx |
| oa oahu - oats | oo oocyte - ooze |
| ob ob - obviously | op op - opus |
| oc ocarina - oculus | or or - orwell |
| od od - odyssey | os os - oswaldo |
| oe oecd - oeuvres | ot ot - ottomans |
| of of - oft-repeated | ou ou - ouzo |
| og ogasawara - ogres | ov oval - ovum |
| oh oh - ohms | ow ow - owns |
| oi oil - ointments | ox ox - oxytocin |
| oj oj - ojibwe | oy oyster - oysters |
| ok ok - oku | oz oz - ozone |
| ol olaf - olympus |