O
1. O, kisik
a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust [nemetalski dvovalentni element, ki je običajno brez barve, vonja, okusa, negorljiv plin; predstavlja 21 odstotkov zemeljske atmosfere po volumnu; najbolj obilen element v zemeljski skorji]
2. O, o
the 15th letter of the Roman alphabet [15. črka rimske abecede]