noun

dioxide

dioxide

Carbon dioxide is a greenhouse gas.

Carbon dioxide is a greenhouse gas.

((noun)) an oxide containing two atoms of oxygen per molecule. Carbon dioxide is essential for plants.

Synonyms: none (it's a specific chemical term)

From the prefix 'di-' (meaning two) and 'oxide' (a compound with oxygen). It means an oxide with two oxygen atoms.

Remember that 'di-' means two, as in 'dilemma' (a choice between two things). Carbon dioxide (CO2) has two oxygen atoms.

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