| dilapidation | (noun) the process of becoming dilapidated | Synonyms: ruin |
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| (noun) a state of deterioration due to old age or long use | Synonyms: decrepitude |
| dilatation | (noun) the act of expanding an aperture | Synonyms: dilation |
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| (noun) the state of being stretched beyond normal dimensions | Synonyms: distension, distention |
| dilater | (noun) a surgical instrument that is used to dilate or distend an opening or an organ | Synonyms: dilator |
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| dilation | (noun) the act of expanding an aperture | Synonyms: dilatation |
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| (noun) a lengthy discussion (spoken or written) on a particular topic | - |
| dilator | (noun) a surgical instrument that is used to dilate or distend an opening or an organ | Synonyms: dilater |
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| (noun) a drug that causes dilation | - |
| (noun) a muscle or nerve that dilates or widens a body part | - |
| dilatoriness | (noun) slowness as a consequence of not getting around to it | Synonyms: procrastination |
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| dildo | (noun) a vibrating device that substitutes for an erect penis to provide vaginal stimulation | - |
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| dilemma | (noun) state of uncertainty or perplexity especially as requiring a choice between equally unfavorable options | Synonyms: quandary |
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| dilettante | (noun) an amateur who engages in an activity without serious intentions and who pretends to have knowledge | Synonyms: dabbler, sciolist |
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| diligence | (noun) a diligent effort | Synonyms: application |
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| (noun) persevering determination to perform a task | Synonyms: industriousness, industry |
| (noun) conscientiousness in paying proper attention to a task; giving the degree of care required in a given situation | - |
| dill | (noun) aromatic threadlike foliage of the dill plant used as seasoning | Synonyms: dill weed |
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| (noun) aromatic Old World herb having aromatic threadlike foliage and seeds used as seasoning | Synonyms: Anethum graveolens |
| dillenia | (noun) any of several evergreen trees or shrubs of the genus Dillenia grown for their foliage and nodding flowers resembling magnolias which are followed by fruit that is used in curries and jellies and preserves | - |
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| dillydallier | (noun) someone who wastes time | Synonyms: dallier, dilly-dallier, lounger, mope |
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| diltiazem | (noun) a calcium blocker (trade name Cardizem) used in treating hypertension or angina or heart failure | Synonyms: Cardizem |
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| diluent | (noun) a diluting agent | Synonyms: dilutant, thinner |
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| dilutant | (noun) a diluting agent | Synonyms: diluent, thinner |
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| dilution | (noun) weakening (reducing the concentration) by the addition of water or a thinner | - |
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| (noun) a diluted solution | - |