Word.ws English Dictionary

13-Letter Words Starting with B

There are 87 thirteen-letter words that start with B on Word.ws, from baccalaureate to butyrolactone. The most common are breastfeeding, biotechnology, businesswoman, brainstorming and baccalaureate.

Meanings from Wiktionary. Not an official Scrabble, Words With Friends or Wordle word list.

All 87 thirteen-letter words that start with B

BA

  • baccalaureate19n. A bachelor's degree.
  • backgrounding24n. The act by which something is backgrounded, in any sense.
  • backscratcher28n. A long slender rod with a rake-like device on one end, sometimes in the...
  • backwardation25n. A situation in a futures market where the price for future delivery of...
  • bacteriophage23n. A virus that specifically infects bacteria.
  • ballistically20adv. In a ballistic manner.
  • balneotherapy23n. The treatment of disease by bathing.
  • bancassurance19n. A banking and insurance structure in which insurance is sold through...
  • basidiomycete23n. Any fungus of the phylum Basidiomycota, that produces sexual spores on...
  • battlecruiser17n. A fast warship with thicker armor and heavier guns than a typical...

BE

  • beatification20n. The act of beatifying, or the state of being beatified; especially, in...
  • beginningless17adj. Incomplete for lack of a beginning.
  • behaviourally24adv. With respect to behaviour.
  • believability23n. The state or quality of being believable.
  • belligerently19adv. In a belligerent manner; with aggressive hostility.
  • belongingness17n. The state or quality of belonging.
  • beneficiation20n. The reduction in size of particles of ore (or similar physical...
  • benzimidazole36n. A bicyclic heterocycle containing a benzene ring fused to that of...
  • betamethasone20n. A potent glucocorticoid C₂₂H₂₉FO₅ that is isomeric with dexamethasone...
  • bewilderingly23adv. In a bewildering manner, or to a bewildering extent.

BI

  • bibliographer23n. A person who compiles bibliographies, or who studies bibliography.
  • bibliographic25adj. Of or pertaining to bibliography.
  • bibliometrics21n. The statistical analysis of texts, especially of published literature...
  • bibliotherapy25n. A nonpharmacological therapy using reading materials to meet people’s...
  • biconditional18adj. Having two conditions.
  • biculturalism19n. The state or quality of being bicultural.
  • bidirectional18adj. Moving in two directions (usually opposite).
  • bildungsroman19n. A novel tracing the spiritual, moral, psychological, or social...
  • bioaccumulate21v. To accumulate in a biological system over time.
  • bioanalytical20adj. Of or pertaining to analytical methods used in biotechnology.
  • bioartificial20adj. Describing any artificial device that has biological components.
  • biobehavioral23adj. Pertaining to the biological causes of behavior.
  • biochemically27adv. With reference to biochemistry.
  • biocompatible23adj. Compatible with biological tissue.
  • bioconversion20n. The conversion of biological material into usable products; but...
  • biodegradable20adj. Capable of being decomposed by biological activity, especially by...
  • bioelectrical19adj. Pertaining to bioelectricity.
  • bioelectronic19adj. Of or pertaining to bioelectronics.
  • bioenergetics18n. The study of the energy transformations that take place in living...
  • bioengineered17adj. Produced, or modified, by bioengineering.
  • biofiltration18n. A technique for pollution control using living material to capture and...
  • biogeographic24adj. Of or pertaining to biogeography.
  • bioinformatic22adj. Of or pertaining to bioinformatics.
  • biomechanical24adj. Of or pertaining to biomechanics.
  • biometrically22adv. In a biometric way; through use of biometrics.
  • biomicroscopy26n. The microscopic examination of biological tissue.
  • biomonitoring18n. The monitoring of the organisms that live in a particular environment...
  • bioprocessing20n. The processing of something using a biological agent.
  • bioprosthetic22adj. Relating to a bioprosthesis.
  • biopsychology29n. Biological psychology.
  • bioresorbable19adj. That can be broken down and absorbed by the body, and thus does not...
  • biostatistics17n. The application of statistics to the study and analysis of biological...
  • biotechnology24n. The use of living organisms (especially microorganisms) in industrial...
  • biotinylation18n. The attachment of a biotin residue to a biological macromolecule in...
  • birefringence21n. The splitting of a ray of light into two parallel rays of perpendicular...
  • biventricular20adj. Relating to two ventricles.

BL

BO

  • bombastically24adv. In a bombastic manner.
  • bootstrapping20n. The process by which something is bootstrapped.
  • bougainvillea19n. Any of several South American flowering shrubs or lianas, of the genus...
  • bouillabaisse17n. A type of fish soup or stew from Provence, France.
  • boundlessness16n. The property of being boundless, of being without limits or ends.
  • boustrophedon21n. Text written such that its direction alternates on each line, resulting...

BR

  • brachiosaurus20n. A large herbivorous sauropod dinosaur, Brachiosaurus altithorax, which...
  • brachydactyly32n. Abnormal shortness of the fingers or toes.
  • brachytherapy31n. Radiotherapy using radioactive sources positioned within (or close to)...
  • braggadocious20adj. Exhibiting braggadocio; characterized by empty boasts.
  • brainstorming18n. A method of problem solving in which members of a group contribute...
  • breastfeeding20n. The act or process of feeding a baby or young child milk from a...
  • breathability23n. The ability of a fabric (or clothing) to transmit air and moisture.
  • breechloading22adj. Describing a breechloader gun: one that has ammunition loaded from the...
  • brokenhearted23adj. Grieved and disappointed, especially by the loss of a beloved person or...
  • bromocriptine21n. A drug used in the treatment of parkinsonism, galactorrhea, and other...
  • bronchiolitis20n. Inflammation of the bronchioles; especially common in young children.
  • bronchoscopic26adj. Of or pertaining to bronchoscopy.
  • brutalization24n. The act or process of making brutal.

BU

  • buprenorphine22n. A semisynthetic narcotic analgesic that is administered in the form of...
  • businesswoman20n. A woman involved in business.
  • butoxyethanol28n. The mono-butyl ether of ethylene glycol; used as a solvent, and in...
  • butterfingers19n. Someone who tends to drop things; (more generally) someone who is...
  • butterflyfish27n. Any of a group of conspicuous tropical marine fish of the family...
  • butyrolactone20n. Any lactone derived from a hydroxybutyric acid.
897 rare thirteen-letter words that start with B

The first 300 are shown.

Questions about these words

How many thirteen-letter words that start with B are there?
Word.ws lists 87 thirteen-letter words that start with B, plus 897 rare ones.
What are common thirteen-letter words that start with B?
breastfeeding, biotechnology, businesswoman, brainstorming, baccalaureate, biodegradable, bibliographic and bidirectional.
Which of the thirteen-letter words that start with B has the highest letter score?
benzimidazole scores 36 points with the standard letter tile values.

Related word lists

Source and license

Word lists and meanings adapted from the Wiktionary entry of each word. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out names, abbreviations, misspellings and offensive words, and ordered the most common words by how often they appear in English (wordfreq). Meanings from Wiktionary; this is not an official Scrabble, Words With Friends or Wordle word list. Wiktionary data of 2026-09-02.

Cite this page: “13-Letter Words Starting with B: 87 Words.” Word.ws, https://word.ws/words/13-letter/starting-with-b. Based on Wiktionary, CC BY-SA 4.0.