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What is another word for o?

What's another word for o? | Here's a list of synonyms for o.

Definition 1: the blood group whose red cells carry neither the A nor B antigens - [noun denoting body]

Definition 1: the 15th letter of the Roman alphabet - [noun denoting communication]

Definition 1: 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 denoting substance]