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isodiaphere
isodiaphere n.
Brit. 
/ˌʌɪsə(ʊ)ˈdʌɪəfɪə/
, /ˌʌɪsə(ʊ)ˈdʌɪəfɪə/U.S. /ˌaɪsoʊˈdaɪəˌfɪ(ə)r/
[ < German Isodiaphere (J. Schintlmeister 1938, in Österreichische Chemiker-Zeitung 41. 319/1), < Greek διαϕέρειν differ, be distinct)] Physics each of two or more nuclides having the same isotopic number./ˌaɪsoʊˈdaɪəˌfɪ(ə)r/ΘΚΠ
the world > matter > physics > atomic nucleus > radioactive isotope > radioactive nuclide > [noun] > with same isotopic number
isodiaphere1947
1947 Amer. Jrnl. Physics 15 356/2 The addition of nuclide to the existing words isotope, isotone, isobar, isodiaphere and isomer complements them by providing a more general term not subject to the limits inherent in any of them.
1984 M. R. Wehr et al. Physics of Atom (ed. 4) xi. 444 3717Cl is an isotope of 3517Cl, an isobar of 3716S, an isotone of 3919K, and an isodiaphere of 3918Ar.
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