Ovum, or ova.
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Some words that start with the letter O are:oceanOddOdeofoffOfficeogreoldOliveOnoneOpalOppositeorOrangeorboreganoorganismorgasmorigamiotherotteroughtOxymoronoval
Five letter words that start and end with letter O are outdo and outgo.
Oman is the only country that begins with the letter O.
The elements that start with the letter O are oxygen & Osmium.
Some words that start with the letter O are, orange, old and Organ. There is also open, olive and order.