| DAGUERREOTYPIST | • daguerreotypist n. A person who makes daguerreotypes. • DAGUERREOTYPIST n. one who practises daguerreotyping, also DAGUERREOTYPER. |
| DEGENERATIONIST | • degenerationist n. (Biology, historical) One who believes in the theory of degenerationism. • DEGENERATIONIST n. someone who believes that the tendency of man is not to improve, but to degenerate. |
| DELEGITIMATIONS | • delegitimations n. Plural of delegitimation. • DELEGITIMATION n. the act of delegitimizing. |
| DEMAGNETISATION | • demagnetisation n. (British spelling) Alternative form of demagnetization. • DEMAGNETISATION n. the act of demagnetising, also DEMAGNETIZATION. |
| DEPHLOGISTICATE | • dephlogisticate v. To take away the phlogiston, i.e. ability to burn, which is now understood to be chemically impossible. • DEPHLOGISTICATE v. to make something fireproof. |
| DEPIGMENTATIONS | • depigmentations n. Plural of depigmentation. • DEPIGMENTATION n. loss of normal pigmentation. |
| DEREGISTRATIONS | • deregistrations n. Plural of deregistration. • DEREGISTRATION n. the act of deregistering. |
| DIGESTIBILITIES | • digestibilities n. Plural of digestibility. • DIGESTIBILITY n. the fitness of something for digestion. |
| DISENTANGLEMENT | • disentanglement n. Removal of, or extrication from twists, tangles, complications or confusion. • DISENTANGLEMENT n. the act of disentangling. |
| DISGRUNTLEMENTS | • disgruntlements n. Plural of disgruntlement. • DISGRUNTLEMENT n. the state of being disgruntled. |
| DYSTELEOLOGISTS | • dysteleologists n. Plural of dysteleologist. • DYSTELEOLOGIST n. a specialist in dysteleology, the study of functionless rudimentary organs in animals and plants. |
| REDINTEGRATIONS | • redintegrations n. Plural of redintegration. • REDINTEGRATION n. revival of the whole of a previous mental state when a phase of it recurs. |
| SEDIMENTOLOGIST | • sedimentologist n. A person involved in sedimentology. • SEDIMENTOLOGIST n. one who studies sedimentology. |
| TIGHTFISTEDNESS | • tightfistedness n. Reluctance to spend money; miserliness. • TIGHTFISTEDNESS n. the state of being tightfisted. |
| UNDERESTIMATING | • underestimating v. Present participle of underestimate. • UNDERESTIMATE v. to estimate as being less than the actual size, quantity, or number. |
| UNDERGRADUETTES | • undergraduettes n. Plural of undergraduette. • UNDERGRADUETTE n. a female undergraduate. |
| UNMITIGATEDNESS | • unmitigatedness n. The quality of being unmitigated. • UNMITIGATEDNESS n. the state of being unmitigated. |