diplogenn.
/ˈdɪplədʒ(ə)n/, U.S. /ˈdɪplədʒən/ Chemistry. Now disused.
= deuterium n.
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D1933
deuterium1933
diplogen1933
protium1933
tritium1933
T1948
1933 E. Rutherford in Nature 23 Dec. 956/2 In consultation with some of my physical and chemical colleagues..the name ‘diplogen’ (διπλοῦς, double) for heavy hydrogen, and ‘diplon’ for the nucleus seemed to meet with some favour.
1935 Proc. Royal Inst. Great Brit. 28 282 Diplogen (or deuterium) may be separated in quantity from heavy water in a nearly pure state.
1936 S. Glasstone Recent Adv. in Gen. Chem. iv. 139 The names ‘haplogen’ (single) and ‘diplogen’ (double), for the isotopes of mass 1 and 2, respectively, were proposed, but they have not met with general acceptance.
1999 Philos. Trans. (Royal Soc.) A. 357 397 The Cambridge group objected to the name ‘deuterium’ proposed by the US group and put forward erudite arguments in favour of ‘diplogen’. The Americans won.
This is a new entry (OED Third Edition, December 2013; most recently modified version published online March 2022).
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n.1933