Wiktionary
dihydrogen
n. 1 (context chemistry English) The divalent radical formed from two separate hydrogen atoms or ions. 2 (context chemistry modifying a noun English) Describing a dihydrogen bond.
Wikipedia
Usage examples of "dihydrogen".
You know: "These compounds are rapidly and safely dispersed into a concentrated solution of dihydrogen oxide and sodium chloride, containing some other inorganic salts.
He talked about sodium chloride and dihydrogen oxide, and I countered that calling trinitrotoluene "dynamite" doesn't make it any safer.
There was, it insisted primly, nothing in the glass but plain old dihydrogen oxide.