| ceratodus | (noun) extinct lungfish | - |
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| dusk | (noun) the time of day immediately following sunset | Synonyms: crepuscle, crepuscule, evenfall, fall, gloam, gloaming, nightfall, twilight |
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| duskiness | (noun) a swarthy complexion | Synonyms: darkness, swarthiness |
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| (noun) the state of being poorly illuminated | Synonyms: dimness |
| dust | (noun) fine powdery material such as dry earth or pollen that can be blown about in the air | - |
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| (noun) the remains of something that has been destroyed or broken up | Synonyms: debris, detritus, junk, rubble |
| (noun) free microscopic particles of solid material | - |
| dustbin | (noun) a bin that holds rubbish until it is collected | Synonyms: ash-bin, ash bin, ashbin, ashcan, garbage can, trash barrel, trash bin, trash can, wastebin |
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| dustcart | (noun) a truck for collecting domestic refuse | Synonyms: garbage truck |
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| dustcloth | (noun) a piece of cloth used for dusting | Synonyms: duster, dustrag |
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| duster | (noun) a pitch thrown deliberately close to the batter | - |
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| (noun) a loose coverall (coat or frock) reaching down to the ankles | Synonyms: dust coat, gabardine, gaberdine, smock |
| (noun) a piece of cloth used for dusting | Synonyms: dustcloth, dustrag |
| (noun) a windstorm that lifts up clouds of dust or sand | Synonyms: dust storm, sandstorm, sirocco |
| dustiness | (noun) the state of being covered with dust | - |
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| dustman | (noun) someone employed to collect and dispose of refuse | Synonyms: garbage carter, garbage collector, garbage hauler, garbage man, garbageman, refuse collector |
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| dustmop | (noun) a dry swab for dusting floors | Synonyms: dry mop, dust mop |
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| dustpan | (noun) a short-handled receptacle into which dust can be swept | - |
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| (noun) the quantity that a dustpan will hold | Synonyms: dustpanful |
| dustpanful | (noun) the quantity that a dustpan will hold | Synonyms: dustpan |
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| dustrag | (noun) a piece of cloth used for dusting | Synonyms: dustcloth, duster |
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| dustup | (noun) an angry dispute | Synonyms: quarrel, row, run-in, words, wrangle |
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| exodus | (noun) a journey by a large group to escape from a hostile environment | Synonyms: hegira, hejira |
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| fundus | (noun) (anatomy) the base of a hollow organ or that part of the organ farthest from its opening | - |
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| indusium | (noun) a membrane enclosing and protecting the developing spores especially that covering the sori of a fern | - |
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| industrialisation | (noun) the development of industry on an extensive scale | Synonyms: industrial enterprise, industrialization |
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| industrialism | (noun) an economic system built on large industries rather than on agriculture or craftsmanship | - |
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| industrialist | (noun) someone who manages or has significant financial interest in an industrial enterprise | - |
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| industrialization | (noun) the development of industry on an extensive scale | Synonyms: industrial enterprise, industrialisation |
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| industriousness | (noun) persevering determination to perform a task | Synonyms: diligence, industry |
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| industry | (noun) the organized action of making of goods and services for sale | Synonyms: manufacture |
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| (noun) persevering determination to perform a task | Synonyms: diligence, industriousness |
| (noun) the people or companies engaged in a particular kind of commercial enterprise | - |
| medusa | (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusan, medusoid |
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| medusan | (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusa, medusoid |
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| medusoid | (noun) one of two forms that coelenterates take: it is the free-swimming sexual phase in the life cycle of a coelenterate; in this phase it has a gelatinous umbrella-shaped body and tentacles | Synonyms: medusa, medusan |
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| nidus | (noun) a nest in which spiders or insects deposit their eggs | - |
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| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, focus |
| sawdust | (noun) fine particles of wood made by sawing wood | - |
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| solidus | (noun) a punctuation mark (/) used to separate related items of information | Synonyms: diagonal, separatrix, slash, stroke, virgule |
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| (noun) a gold coin of the Byzantine Empire; widely circulated in Europe in the Middle Ages | Synonyms: bezant, bezzant, byzant |
| stardust | (noun) a dreamy romantic or sentimental quality | - |
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