| blue | (adjective) of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky | Synonyms: blueish, bluish |
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| (adjective) filled with melancholy and despondency | Synonyms: depressed, dispirited, down, down in the mouth, downcast, downhearted, gloomy, grim, low-spirited, low |
| (adjective) causing dejection | Synonyms: dark, dingy, disconsolate, dismal, drab, drear, dreary, gloomy, grim, sorry |
| (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, aristocratical, blue-blooded, gentle, patrician |
| (adjective) morally rigorous and strict | Synonyms: puritanic, puritanical |
| (adjective) used to signify the Union forces in the American Civil War (who wore blue uniforms) | - |
| (adjective) suggestive of sexual impropriety | Synonyms: gamey, gamy, juicy, naughty, racy, risque, spicy |
| (adjective) characterized by profanity or cursing | Synonyms: blasphemous, profane |
| (noun) any of numerous small butterflies of the family Lycaenidae | - |
| (noun) the sodium salt of amobarbital that is used as a barbiturate; used as a sedative and a hypnotic | Synonyms: amobarbital sodium, Amytal, blue angel, blue devil |
| (noun) blue clothing | - |
| (noun) blue color or pigment; resembling the color of the clear sky in the daytime | Synonyms: blueness |
| (noun) any organization or party whose uniforms or badges are blue | - |
| (noun) the sky as viewed during daylight | Synonyms: blue air, blue sky, wild blue yonder |
| (noun) used to whiten laundry or hair or give it a bluish tinge | Synonyms: blueing, bluing |
| (verb) turn blue | - |
| bluebell | (noun) one of the most handsome prairie wildflowers having large erect bell-shaped bluish flowers; of moist places in prairies and fields from eastern Colorado and Nebraska south to New Mexico and Texas | Synonyms: Eustoma grandiflorum, prairie gentian, tulip gentian |
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| (noun) perennial of Northern Hemisphere with slender stems and bell-shaped blue flowers | Synonyms: Campanula rotundifolia, harebell |
| (noun) sometimes placed in genus Scilla | Synonyms: harebell, Hyacinthoides nonscripta, Scilla nonscripta, wild hyacinth, wood hyacinth |
| blueberry | (noun) sweet edible dark-blue berries of either low-growing or high-growing blueberry plants | - |
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| (noun) any of numerous shrubs of the genus Vaccinium bearing blueberries | Synonyms: blueberry bush |
| bluebill | (noun) diving ducks of North America having a bluish-grey bill | Synonyms: broadbill, scaup, scaup duck |
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| bluebird | (noun) blue North American songbird | - |
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| (noun) fruit-eating mostly brilliant blue songbird of the East Indies | Synonyms: fairy bluebird |
| bluebonnet | (noun) a brimless dark blue Scottish cap with a flat top and a plume on one side | Synonyms: Balmoral |
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| (noun) low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States | Synonyms: buffalo clover, Lupinus subcarnosus, Texas bluebonnet |
| bluebottle | (noun) blowfly with iridescent blue body; makes a loud buzzing noise in flight | Synonyms: Calliphora vicina |
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| (noun) an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers | Synonyms: bachelor's button, Centaurea cyanus, cornflower |
| bluecoat | (noun) a person dressed all in blue (as a soldier or sailor) | - |
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| bluefin | (noun) largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics | Synonyms: bluefin tuna, horse mackerel, Thunnus thynnus |
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| (noun) flesh of very large tuna | Synonyms: bluefin tuna |
| bluefish | (noun) bluish warm-water marine food and game fish that follow schools of small fishes into shallow waters | Synonyms: Pomatomus saltatrix |
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| (noun) fatty bluish flesh of bluefish | - |
| bluegill | (noun) important edible sunfish of eastern and central United States | Synonyms: Lepomis macrochirus |
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| bluegrass | (noun) a type of country music played at a rapid tempo on banjos and guitars | - |
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| (noun) any of various grasses of the genus Poa | Synonyms: blue grass |
| bluehead | (noun) small Atlantic wrasse the male of which has a brilliant blue head | Synonyms: Thalassoma bifasciatum |
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| blueing | (noun) a process that makes something blue (or bluish) | Synonyms: bluing |
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| (noun) used to whiten laundry or hair or give it a bluish tinge | Synonyms: blue, bluing |
| blueish | (adjective) of the color intermediate between green and violet; having a color similar to that of a clear unclouded sky | Synonyms: blue, bluish |
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| bluejacket | (noun) a serviceman in the navy | Synonyms: navy man, sailor, sailor boy |
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| blueness | (noun) blue color or pigment; resembling the color of the clear sky in the daytime | Synonyms: blue |
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| bluenose | (noun) a native or inhabitant of Nova Scotia | Synonyms: Nova Scotian |
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| bluepoint | (noun) small edible oyster typically from the southern shore of Long Island | Synonyms: blue point |
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| (noun) oysters originally from Long Island Sound but now from anywhere along the northeastern seacoast; usually eaten raw | Synonyms: blue point |
| blueprint | (noun) photographic print of plans or technical drawings etc. | - |
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| (noun) something intended as a guide for making something else | Synonyms: design, pattern |
| (verb) make a blueprint of | Synonyms: draft, draught |
| blues | (noun) a type of folksong that originated among Black Americans at the beginning of the 20th century; has a melancholy sound from repeated use of blue notes | - |
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| (noun) a state of depression | Synonyms: blue devils, megrims, vapors, vapours |
| bluestem | (noun) tall grass with smooth bluish leaf sheaths grown for hay in the United States | Synonyms: Andropogon furcatus, Andropogon gerardii, blue stem |
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| bluestocking | (noun) a woman having literary or intellectual interests | Synonyms: bas bleu |
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| bluestone | (noun) bluish-grey sandstone used for paving and building | - |
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| bluethroat | (noun) songbird of northern Europe and Asia | Synonyms: Erithacus svecicus |
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| bluetick | (noun) a very fast American hound; white mottled with bluish grey | - |
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| bluetongue | (noun) a viral disease of sheep and cattle that is transmitted by biting midges | - |
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| blueweed | (noun) a coarse prickly European weed with spikes of blue flowers; naturalized in United States | Synonyms: blue devil, blue thistle, Echium vulgare, viper's bugloss |
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| bluewing | (noun) American teal | Synonyms: Anas discors, blue-winged teal |
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