o

This word does not have a syllable breakdown in our dictionary yet, so pronunciation and parts are not shown.

noun. The blood group whose red cells carry neither the A nor B antigens.

noun. 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.

noun. The 15th letter of the Roman alphabet.