English Words Starting With I

• isomer

  nounC2
  /ˈaɪ.sə.mə/A molecule with the same molecular formula as another molecule but a different arrangement of atoms, giving it different chemical or physical properties.
• isomerase

  nounC1
  /ʌɪˈsɒməreɪz/An enzyme that catalyzes the conversion of a molecule into one of its isomers.
• isomerism

  nounLow (C2/Technical)
  /aɪˈsɒm.ər.ɪ.zəm/The phenomenon whereby two or more chemical compounds have the same molecular formula but different structural arrangements or spatial orientations, resulting in different properties.
• isomerize

  verbverb-ambitransitiveC2
  /aɪˈsɒməraɪz/To undergo or cause to undergo isomerism; to change into an isomer.
• isometric

  adjectivenounLow
  /ˌaɪ.səʊˈmet.rɪk/Having equal dimensions or measure; in mathematics and physical sciences: involving equality of measure, particularly length.
• isometric exercise

  nounC1
  /ˌaɪ.səʊˈmet.rɪk ˈek.sə.saɪz/A form of strength training in which the joint angle and muscle length do not change during contraction, performed against an immovable object or by tensing the muscle without movement.
• isometrics

  nounC1
  /ˌaɪ.səʊˈmet.rɪks/A system of physical exercises where muscles are tensed against an immovable object or another muscle group, without joint movement, to build strength.
• isometropia

  nounVery Rare
  /ˌaɪ.səʊ.mɪˈtrəʊ.pi.ə/A state in which the refractive error of both eyes is identical in nature and degree.
• isometry

  nounC2
  /aɪˈsɒm.ɪ.tri/A transformation or mapping that preserves distances between points.
• isomorph

  nounC2
  /ˈaɪ.sə(ʊ).mɔːf/An entity (object, structure, or organism) that has the same form or shape as another.
• isomorphism

  nounC2
  /ˌaɪ.səˈmɔː.fɪ.zəm/A structural similarity or sameness in form between two different entities or systems, allowing a one-to-one correspondence between their elements.
• isoneph

  nounVery low
  /ˈaɪ.səʊ.nɛf/A line on a map connecting points of equal cloud cover.
• isoniazid

  nounC2
  /ˌaɪsə(ʊ)ˈnaɪəzɪd/A synthetic compound used as a primary antibiotic in the treatment and prevention of tuberculosis.
• isonicotinic acid hydrazide

  nounVery Low
  /ˌaɪsəʊˌnaɪkəˌtɪnɪk ˈæsɪd ˈhaɪdrəzaɪd/A chemical compound, specifically the hydrazide derivative of isonicotinic acid, used primarily as an antibiotic.
• isonome

  nounExtremely Rare / Technical / Obsolete
  /ˈaɪsə(ʊ)nəʊm/An equalising principle, condition, or line; specifically, a theoretical line connecting points of equal population density.
• isonomy

  nounVery Rare
  /aɪˈsɒnəmi/Equality of political rights; equal laws or legal rights for all citizens.
• isonzo

  nounVery Low (C2)
  /ɪˈzɒn(t)səʊ/A river in northeastern Italy, historically significant as a major battlefield in World War I.
• isooctane

  nounVery low
  /ˌaɪsəʊˈɒkteɪn/A specific, highly branched-chain isomer of octane (C8H18), primarily used as a standard reference fuel for measuring the anti-knock rating (octane number) of petrol/gasoline.
• isopach

  nounVery Rare
  /ˈaɪsə(ʊ)pak/A line on a map connecting points of equal thickness of a geological stratum or layer.
• isopag

  nounVery Low
  /ˈaɪsə(ʊ)paɡ/A line on a map connecting points where sea ice is of the same age or where ice cover is present for an equal number of days per year.

Showing 3381–3400 of 3621 words.