What does "dioxygen" mean?

Diatomic oxygen: the normal allotrope of oxygen, having two atoms per molecule.

What is a synonym for "dioxygen"?

Common synonyms include: produce oxygen.

Pronounced //daɪˈɒksɪdʒən//.

/daɪˈɒksɪdʒən/ noun

noun ·Rare ·Advanced level

Noun

1
Diatomic oxygen: the normal allotrope of oxygen, having two atoms per molecule. uncountable
"Meronym: oxygen (strict sense)"
2
Two atoms of oxygen in a molecule. in-compounds, uncountable

From di- + oxygen.