| dip | (noun) a brief swim in water | Synonyms: plunge |
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| (noun) a gymnastic exercise on the parallel bars in which the body is lowered and raised by bending and straightening the arms | - |
| (noun) a candle that is made by repeated dipping in a pool of wax or tallow | - |
| (noun) a sudden sharp decrease in some quantity | Synonyms: drop, fall, free fall |
| (noun) a brief immersion | - |
| (noun) tasty mixture or liquid into which bite-sized foods are dipped | - |
| (noun) a thief who steals from the pockets or purses of others in public places | Synonyms: cutpurse, pickpocket |
| (noun) (physics) the angle that a magnetic needle makes with the plane of the horizon | Synonyms: angle of dip, inclination, magnetic dip, magnetic inclination |
| (noun) a depression in an otherwise level surface | - |
| diphenhydramine | (noun) antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness | Synonyms: Benadryl |
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| diphenylhydantoin | (noun) an anticonvulsant drug (trade name Dilantin) used to treat epilepsy and that is not a sedative | Synonyms: Dilantin, phenytoin |
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| diphtheria | (noun) acute contagious infection caused by the bacterium Corynebacterium diphtheriae; marked by the formation of a false membrane in the throat and other air passages causing difficulty in breathing | - |
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| diphthong | (noun) a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another | - |
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| diplegia | (noun) paralysis of corresponding parts on both sides of the body | - |
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| diplococcus | (noun) Gram-positive bacteria usually occurring in pairs | - |
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| diplodocus | (noun) a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America | - |
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| diploid | (noun) (genetics) an organism or cell having the normal amount of DNA per cell; i.e., two sets of chromosomes or twice the haploid number | - |
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| diploidy | (noun) the condition of being diploid | - |
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| diploma | (noun) a document certifying the successful completion of a course of study | Synonyms: sheepskin |
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| diplomacy | (noun) subtly skillful handling of a situation | Synonyms: delicacy, discreetness, finesse |
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| (noun) wisdom in the management of public affairs | Synonyms: statecraft, statesmanship |
| (noun) negotiation between nations | Synonyms: diplomatic negotiations |
| diplomat | (noun) an official engaged in international negotiations | Synonyms: diplomatist |
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| (noun) a person who deals tactfully with others | - |
| diplomate | (noun) medical specialist whose competence has been certified by a diploma granted by an appropriate professional group | - |
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| diplomatist | (noun) an official engaged in international negotiations | Synonyms: diplomat |
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| diplopia | (noun) visual impairment in which an object is seen as two objects | Synonyms: double vision |
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| diplotene | (noun) the fourth stage of the prophase of meiosis | - |
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| dipole | (noun) an aerial half a wavelength long consisting of two rods connected to a transmission line at the center | Synonyms: dipole antenna |
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| (noun) a pair of equal and opposite electric charges or magnetic poles separated by a small distance | - |
| dipper | (noun) small North American diving duck; males have bushy head plumage | Synonyms: Bucephela albeola, bufflehead, butterball |
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| (noun) small stocky diving bird without webbed feet; frequents fast-flowing streams and feeds along the bottom | Synonyms: water ouzel |
| (noun) a ladle that has a cup with a long handle | - |
| dipsomania | (noun) an intense persistent desire to drink alcoholic beverages to excess | Synonyms: alcoholism, potomania |
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| dipsomaniac | (noun) a person who drinks alcohol to excess habitually | Synonyms: alcoholic, alky, boozer, lush, soaker, souse |
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| dipstick | (noun) a graduated rod dipped into a container to indicate the fluid level | - |
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| dipteran | (noun) insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing | Synonyms: dipteron, dipterous insect, two-winged insects |
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| dipterocarp | (noun) tree of the family Dipterocarpaceae | - |
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| dipteron | (noun) insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing | Synonyms: dipteran, dipterous insect, two-winged insects |
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| diptych | (noun) a painting or carving (especially an altarpiece) on two panels (usually hinged like a book) | - |
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