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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)

bolster
nounverbverb-transitiveC1
/ˈbəʊl.stər/to support, strengthen, or reinforce something; also, a long thick pillow.
bolstered
adjectiveverbB2
/ˈbəʊl.stəd/To support, strengthen, or reinforce something, often by adding material, evidence, or emotional encouragement.
bolt
adverbnounverb+2B2
/bəʊlt/A sudden, fast movement to escape or move away; a metal bar for fastening objects; a flash of lightning.
bolt boat
nounB1
/bəʊlt/A metal pin or bar, often with a thread, used to fasten things together; to move or run away suddenly and quickly.
bolt hole
nounC1
/ˈbəʊlt ˌhəʊl/A place where one can escape and hide, especially from danger or trouble.
boltel
nounVery Low
/ˈbɒltəl/A squared timber or a round moulding in architecture.
bolter
nounC1/C2
/ˈbəʊltə(r)/A person or thing that moves or escapes suddenly or unexpectedly.
bolthead
nounVery Low (Obsolete/Technical)
/ˈbəʊlthɛd/The upper, spherical part of a retort (a glass container with a long neck, used in distillation), typically where the heated substance collects.
bolting cloth
nounC2/Rare/Technical
/ˈbəʊl.tɪŋ ˌklɒθ/A fine, strong, plain-woven fabric, typically of silk or synthetic fibre, used as a sieve in flour milling and for other filtering purposes.
bolton
nounLow
/ˈbəʊl.tən/A town in Greater Manchester, England.
boltonia
nounLow
/bəʊlˈtəʊnɪə/A genus of tall, perennial flowering plants in the aster family, native to North America and Asia, known for their late summer and autumn blooms of small white or lilac daisy-like flowers.
boltrope
nounLow
/ˈbəʊltrəʊp/A rope sewn into the edge of a sail to strengthen it and prevent tearing.
boltzmann
nounLow
/ˈbɒltsmən/Relating to the Austrian physicist Ludwig Boltzmann, particularly in physics and thermodynamics.
boltzmann constant
nounRare (exclusively technical/scientific)
/ˈbɒltsmən ˌkɒnstənt/A fundamental physical constant relating the average kinetic energy of particles in a gas to the absolute temperature.
bolus
nounC2
/ˈbəʊləs/A small, rounded mass of a substance, especially of chewed food at the moment of swallowing.
bolyai
nounExtremely Low
/ˈboʊljɒ.i/A mathematical term referring specifically to Janos Bolyai's contributions to non-Euclidean geometry.
bolzano
nounVery Low
/bɒlˈtsɑːnəʊ/A proper noun, primarily referring to the city in northern Italy.
bolzano -weierstrass theorem
nounC2
/bɒlˈtsɑːnəʊ ˈvaɪəˌʃtrɑːs ˌθɪərəm/A fundamental theorem in real analysis stating that every bounded sequence in ℝⁿ has a convergent subsequence.
boma
nounVery Low (Specialist/Loanword)
/ˈbəʊmə/A temporary livestock enclosure, camp, or defensive fortification of thorny branches, particularly in East Africa.
bomarc
nounVery Low
/ˈbəʊmɑːk/A surface-to-air guided missile developed by the United States in the 1950s and 1960s.

Showing 6441–6460 of 10030 words.