English Words Starting With F

• fiancee

  nounB2
  /fiˈɒn.seɪ/A woman who is engaged to be married.
• fianchetto

  nounverbverb-ambitransitiveC2
  /ˌfiənˈtʃɛtəʊ/A chess opening in which a bishop is developed to the second rank on the long diagonal, particularly the flank of the king or queen.
• fianna

  plural-nounVery Low
  /ˈfiːənə/A plural noun referring to bands of young warrior-hunters in early Irish mythology and legend.
• fianna fail

  nounC2
  /ˌfiːənə ˈfɔɪl/A major Irish political party, literally meaning 'Soldiers of Destiny'.
• fiasco

  nounC1
  /fiˈæs.kəʊ/A complete and humiliating failure or collapse.
• fiat

  nounC1/C2 (Low frequency, academic/formal/business contexts).
  /ˈfiːæt/An official order or decree issued by someone in authority, without the need for further consultation or consent; formal authorization.
• fiat money

  nounC1
  /ˈfiːæt ˌmʌni/Currency that a government has declared to be legal tender, but which has no intrinsic value and is not backed by a physical commodity like gold or silver.
• fib

  nounverbverb-intransitiveC1
  /fɪb/A small, trivial, or harmless lie.
• fiber

  nounB1
  /ˈfaɪ.bər/A thin, thread-like strand, typically of a natural or synthetic material.
• fiber bundle

  nounC2
  /ˌfaɪ.bə ˈbʌn.dl̩/A mathematical structure that projects a more complex space onto a simpler one in a consistent, local way.
• fiber optics

  nounC1
  /ˌfaɪ.bər ˈɒp.tɪks/The branch of physics and technology concerned with transmitting light (data) through thin, flexible glass or plastic fibers, based on the principle of total internal reflection.
• fiber pen

  nounB1
  /ˈfaɪ.bə ˌpen/A writing instrument with a tip made from compressed, porous fibres, used for marking on surfaces like paper, cardboard, or fabric.
• fiberboard

  nounB2
  /ˈfaɪ.bə.bɔːd/A sheet of building material made from compressed wood fibers, often with added resins or binders.
• fiberfill

  nounC1-C2 / Specialized / Low-frequency
  /ˈfaɪ.bə.fɪl/A synthetic insulating material used as padding in items like jackets, sleeping bags, or quilts, typically made from polyester fibres.
• fiberglass

  nounverb-intransitiveverb-transitiveB2
  /ˈfaɪ.bə.ɡlɑːs/A strong, lightweight material consisting of extremely fine fibers of glass embedded in resin, used for insulation and structural applications.
• fiberize

  verb-transitiveLow
  /ˈfaɪ.bə.raɪz/To break or convert something into fibers or a fibrous form.
• fiberscope

  nounC1
  /ˈfaɪ.bə.skəʊp/A flexible optical instrument using fibre optics for viewing inside the human body or machinery.
• fibiger

  nounVery Low
  /ˈfiːbɪɡə/A proper noun, specifically a surname of Scandinavian (primarily Danish) origin.
• fibonacci

  nounC2
  /ˌfɪbəˈnɑːtʃi/Of or relating to the Fibonacci sequence, where each number is the sum of the two preceding ones, typically starting with 0 and 1.
• fibonacci numbers

  plural-nounLow
  /ˌfɪb.əˈnɑː.tʃi ˈnʌm.bəz/A sequence of integers where each number is the sum of the two preceding ones, typically starting with 0 and 1.

Showing 1461–1480 of 5868 words.