D−

Note that this entry uses the minus sign. See also D- which uses the hyphen. D- Appendix:Variations of "d" Translingual Alternative forms D− mul D- D- Etymology D + − Symbol mul symbol mul chemistry the first negative ion of deuterium Coordinate terms mul D+ D+ — the positive ion of deuterium mul D — neutral deuterium radical mul H− H− (H-) — the first negative ion of protium mul H — neutral protium radical mul H+ H+ (p) — the positive ion of protium mul T− T− (T-) — the first negative ion of tritium mul T — neutral tritium radical mul T+ T+ — the positive ion of tritium mul H− H− (H-) — the first negative ion of hydrogen mul H — neutral hydrogen radical mul H+ H+ — the positive ion of hydrogen English Pronunciation as "D minus" Noun 's An academic grade given by certain institutions. Slightly better than an E+ and slightly worse than a D. D minuses are sometimes the lowest passing grades. Coordinate terms D+, D en Academic grades