Trihydrogen oxide is a chemical name for water (H₂O). It consists of two hydrogen atoms covalently bonded to one oxygen atom. The name "trihydrogen oxide" reflects its molecular composition, with "tri-" indicating three atoms of hydrogen (in this case, two atoms of hydrogen and one of oxygen). This terminology is sometimes used in scientific discussions, particularly in contexts emphasizing the chemical properties of water, but it is not commonly used in everyday language.
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