| deuteranopia | (noun) dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red | Synonyms: Daltonism, green-blindness |
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| deuterium | (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) | Synonyms: heavy hydrogen |
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| deuteron | (noun) the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators | - |
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| eutectic | (noun) a mixture of substances having a minimum melting point | - |
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| lieutenancy | (noun) the position of a lieutenant | - |
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| lieutenant | (noun) an officer in a police force | Synonyms: police lieutenant |
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| (noun) a commissioned military officer | - |
| (noun) an assistant with power to act when his superior is absent | Synonyms: deputy |
| (noun) an officer holding a commissioned rank in the United States Navy or the United States Coast Guard; below lieutenant commander and above lieutenant junior grade | - |
| neuter | (noun) a gender that refers chiefly (but not exclusively) to inanimate objects (neither masculine nor feminine) | - |
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| neutering | (noun) the sterilization of an animal | Synonyms: altering, fixing |
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| sublieutenant | (noun) an officer ranking next below a lieutenant | - |
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