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English Words Starting With B

10,030 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

blue john
nounVery low frequency
/ˌbluː ˈdʒɒn/A rare, semi-precious variety of fluorspar (fluorite) characterized by bands of deep purple and yellow or white, mined historically in Derbyshire, England.
blue law
nounC1
/ˌbluː ˈlɔː/A law that prohibits certain activities, especially business or entertainment, on Sundays or religious holidays.
blue laws
plural-nounC1-C2 / Low-frequency
/ˌbluː ˈlɔːz/Laws, especially local ordinances, that restrict or prohibit certain activities, such as shopping, sports, or entertainment, on Sundays for religious or moral reasons.
blue lias
nounRare/Very Low
/ˌbluː ˈlaɪ.əs/A type of limestone rock or argillaceous limestone, typically bluish-grey in colour, formed during the Lower Jurassic period.
blue light
nounHigh (in core sense). Medium-High (in extended 'screen' sense).
/ˌbluː ˈlaɪt/A blue-coloured light used as a signal, especially on emergency vehicles like police cars and ambulances.
blue line
nounB2
/ˌbluː ˈlaɪn/A blue-coloured line, often used for visual demarcation or guidance.
blue lips
nounLow to Medium
/bluː lɪps/A physical condition in which a person's lips appear bluish or purplish in colour, typically caused by a lack of oxygen in the blood.
blue lotus
nounLow (Specialist/Historical/Contextual)
/ˌbluː ˈləʊ.təs/A water lily (Nymphaea caerulea) with blue flowers, historically and symbolically significant in various cultures.
blue mantle
nounC2/Extremely rare
/ˌbluː ˈmæn.təl/A garment or cloak, typically sleeveless, that is blue in colour.
blue marlin
nounLow-Frequency (specialized, technical)
/ˌbluː ˈmɑː.lɪn/A large, fast-swimming, migratory billfish (Makaira nigricans) found in tropical and subtropical waters, prized as a game fish for its size and fighting ability.
blue mass
nounVery Low
/bluː mæs/A historical medicinal preparation of mercury.
blue melilot
nounRare
/bluː ˈmɛlɪlɒt/A flowering plant of the genus Melilotus, typically having blue or bluish flowers, such as Melilotus caeruleus.
blue merle
nounLow
/ˌbluː ˈmɜːl/A specific coat colour pattern in dogs, particularly in herding breeds, characterized by a mottled or marbled grey and black base with patches of lighter colour.
blue mockingbird
nounLow
/ˌbluː ˈmɒk.ɪŋ.bɜːd/A specific species of songbird (Melanotis caerulescens) native to Mexico and Central America, known for its blue plumage and mimicry abilities.
blue mold
nounLow
/ˌbluː ˈməʊld/A type of fungus, often Penicillium species, that appears as a bluish-green powdery growth on organic matter, especially food.
blue monday
nounC1/C2
/ˌbluː ˈmʌndeɪ/A Monday, typically the third one in January, popularly regarded as the most depressing day of the year due to a combination of bad weather, post-holiday blues, debt from Christmas, failed New Year's resolutions, and the return to routine.
blue moon
idiomnounB2
/ˌbluː ˈmuːn/An astronomical event where the moon appears full twice in a single calendar month, or the third full moon in a season containing four full moons.
blue mould
nounC1
/ˌbluː ˈməʊld/A common type of fungus that appears as a bluish-green, fuzzy growth on decaying organic matter, especially food.
blue mountains
plural-nounB2
/ˌbluː ˈmaʊn.tɪnz/A proper noun referring to a specific mountain range, most famously the Blue Mountains in New South Wales, Australia.
blue mud
nounC2
/bluː mʌd/A type of marine sediment or clay deposit that has a distinctive bluish-grey colour, typically found in deep-sea or estuarine environments.

Showing 5821–5840 of 10030 words.