O

Words with a similar base: O, group_O, type_O

'O'

[oxygen.n.01] as in: 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

'O'

[o.n.02] as in: the 15th letter of the Roman alphabet

'O'

[o.n.03] as in: the blood group whose red cells carry neither the A nor B antigens

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Examples:
people with type O blood are universal donors