| dyad | (noun) two items of the same kind | Synonyms: brace, couple, couplet, distich, duad, duet, duo, pair, span, twain, twosome, yoke |
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| dyarchy | (noun) a form of government having two joint rulers | Synonyms: diarchy |
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| dybbuk | (noun) (Jewish folklore) a demon that enters the body of a living person and controls that body's behavior | Synonyms: dibbuk |
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| dye | (noun) a usually soluble substance for staining or coloring e.g. fabrics or hair | Synonyms: dyestuff |
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| dyeing | (noun) the use of dye to change the color of something permanently | - |
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| dyer | (noun) someone whose job is to dye cloth | - |
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| dyestuff | (noun) a usually soluble substance for staining or coloring e.g. fabrics or hair | Synonyms: dye |
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| dyeweed | (noun) small Eurasian shrub having clusters of yellow flowers that yield a dye; common as a weed in Britain and the United States; sometimes grown as an ornamental | Synonyms: dyer's-broom, dyer's greenweed, Genista tinctoria, greenweed, whin, woadwaxen, woodwaxen |
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| dyewood | (noun) any wood from which dye is obtained | - |
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| dying | (noun) the time when something ends | Synonyms: death, demise |
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| dyke | (noun) a barrier constructed to contain the flow of water or to keep out the sea | Synonyms: dam, dike |
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| (noun) (slang) offensive term for a lesbian who is noticeably masculine | Synonyms: butch, dike |
| dynamic | (noun) an efficient incentive | Synonyms: moral force |
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| dynamics | (noun) the branch of mechanics concerned with the forces that cause motions of bodies | Synonyms: kinetics |
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| dynamism | (noun) the activeness of an energetic personality | Synonyms: oomph, pizzaz, pizzazz, zing |
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| (noun) active strength of body or mind | Synonyms: heartiness, vigor, vigour |
| (noun) any of the various theories or doctrines or philosophical systems that attempt to explain the phenomena of the universe in terms of some immanent force or energy | - |
| dynamite | (noun) an explosive containing nitrate sensitized with nitroglycerin absorbed on wood pulp | - |
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| dynamiter | (noun) a person who uses dynamite in a revolutionary cause | Synonyms: dynamitist |
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| dynamitist | (noun) a person who uses dynamite in a revolutionary cause | Synonyms: dynamiter |
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| dynamo | (noun) generator consisting of a coil (the armature) that rotates between the poles of an electromagnet (the field magnet) causing a current to flow in the armature | - |
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| dynamometer | (noun) measuring instrument designed to measure power | Synonyms: ergometer |
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| dynast | (noun) a hereditary ruler | - |
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| dynasty | (noun) a sequence of powerful leaders in the same family | - |
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| dyne | (noun) a unit of force equal to the force that imparts an acceleration of 1 cm/sec/sec to a mass of 1 gram | - |
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| dysaphia | (noun) a disorder in the sense of touch | - |
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| dysarthria | (noun) impaired articulatory ability resulting from defects in the peripheral motor nerves or in the speech musculature | - |
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| dyscalculia | (noun) impaired ability to learn grade-appropriate mathematics | - |
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| dyschezia | (noun) difficulty in defecating (usually as a consequence of long continued voluntary suppression of the urge to defecate) | - |
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| dyscrasia | (noun) an abnormal or physiologically unbalanced state of the body | - |
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| dysentery | (noun) an infection of the intestines marked by severe diarrhea | - |
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| dysfunction | (noun) (medicine) any disturbance in the functioning of an organ or body part or a disturbance in the functioning of a social group | Synonyms: disfunction |
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| dysfunctionality | (noun) The condition of functioning incorrectly or abnormally. | - |
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| dysgenesis | (noun) infertility between hybrids | - |
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| dysgenics | (noun) the study of the operation of factors causing degeneration in the type of offspring produced | Synonyms: cacogenics |
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| dysgraphia | (noun) impaired ability to learn to write | - |
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| dyskinesia | (noun) abnormality in performing voluntary muscle movements | - |
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| dyslectic | (noun) a person who has dyslexia | Synonyms: dyslexic |
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| dyslexia | (noun) impaired ability to learn to read | - |
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| dyslexic | (noun) a person who has dyslexia | Synonyms: dyslectic |
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| dyslogia | (noun) impaired ability to express ideas verbally; usually resulting from difficulties of reasoning (as in feeblemindedness or certain psychoses) | - |
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| dysmenorrhea | (noun) painful menstruation | - |
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| dysomia | (noun) impairment of the sense of smell | - |
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| dysosmia | (noun) a disorder in the sense of smell | Synonyms: olfactory impairment, parosamia |
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| dyspepsia | (noun) a disorder of digestive function characterized by discomfort or heartburn or nausea | Synonyms: indigestion, stomach upset, upset stomach |
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| dyspeptic | (noun) a person suffering from indigestion | - |
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| dysphagia | (noun) condition in which swallowing is difficult or painful | - |
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| dysphasia | (noun) an impairment of language (especially speech production) that is usually due to brain damage | - |
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| dysphemism | (noun) an offensive or disparaging expression that is substituted for an inoffensive one | - |
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| dysphonia | (noun) speech disorder attributable to a disorder of phonation | - |
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| dysphoria | (noun) abnormal depression and discontent | - |
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| dysplasia | (noun) abnormal development (of organs or cells) or an abnormal structure resulting from such growth | - |
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| dyspnea | (noun) difficult or labored respiration | Synonyms: dyspnoea |
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| dyspnoea | (noun) difficult or labored respiration | Synonyms: dyspnea |
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| dysprosium | (noun) a trivalent metallic element of the rare earth group; forms compounds that are highly magnetic | Synonyms: atomic number 66, Dy |
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| dyssynergia | (noun) inability to coordinate voluntary muscle movements; unsteady movements and staggering gait | Synonyms: ataxia, ataxy, motor ataxia |
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| dysthymia | (noun) mild chronic depression | Synonyms: dysthymic depression |
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| dystopia | (noun) a work of fiction describing an imaginary place where life is extremely bad because of deprivation or oppression or terror | - |
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| (noun) state in which the conditions of life are extremely bad as from deprivation or oppression or terror | - |
| dystrophy | (noun) any degenerative disorder resulting from inadequate or faulty nutrition | - |
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| (noun) any of several hereditary diseases of the muscular system characterized by weakness and wasting of skeletal muscles | Synonyms: muscular dystrophy |
| dysuria | (noun) painful or difficult urination | - |
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