dihydrogen

== English == === Etymology === From di- + hydrogen. === Pronunciation === (Received Pronunciation) IPA(key): /ˌdaɪˈhaɪdɹəd͡ʒ(ə)n/ (General American) IPA(key): /ˌdaɪˈhaɪdɹəd͡ʒ(ə)n/ Rhymes: -aɪdɹədʒən Hyphenation: di‧hy‧dro‧gen === Noun === dihydrogen (uncountable) (chemistry) The divalent radical formed from two separate hydrogen atoms or ions. (chemistry, modifying a noun) Describing a dihydrogen bond. (inorganic chemistry) The diatomic hydrogen molecule H2. ==== Usage notes ==== Used informally in dihydrogen monoxide, the supposed scientific name for water. Used in mixed salts, such as calcium dihydrogen phosphate. ==== Derived terms ==== calcium dihydrogen phosphate dihydrogen arsenate dihydrogen monoxide dihydrogen oxide dihydrogen phosphate ==== Related terms ====