English Words Starting With I

• isothiocyanate

  nounVery Low Frequency (C2)
  /ˌaɪ.sə(ʊ)ˌθaɪ.ə(ʊ)ˈsaɪ.ə.neɪt/A chemical compound containing the functional group –N=C=S, commonly found in cruciferous vegetables like broccoli and cabbage, and known for its pungent taste and biological properties.
• isotone

  nounVery Rare (C2+)
  /ˈaɪ.sə.təʊn/One of two or more nuclides (atoms) that have the same number of neutrons but different numbers of protons (and thus different atomic numbers).
• isotonic exercise

  nounC2
  /ˌaɪ.səʊˈtɒn.ɪk ˈek.sə.saɪz/A type of physical movement where muscles contract and shorten while moving a constant load, as in lifting a weight or doing a push-up.
• isotonic sodium chloride solution

  nounC2
  /ˌaɪ.səʊˈtɒn.ɪk ˈsəʊ.di.əm ˈklɔː.raɪd səˈluː.ʃən/A sterile saline solution containing sodium chloride (NaCl) at a concentration (typically 0.9%) that is equal in osmotic pressure to that of human blood plasma; used as an intravenous fluid for hydration and electrolyte replacement.
• isotope

  nounC2
  /ˈaɪ.sə.təʊp/One of two or more forms of a chemical element that have the same atomic number but different atomic masses.
• isotope geology

  nounVery Low (specialist/academic)
  /ˈaɪ.sə.təʊp dʒiˈɒl.ə.dʒi/The branch of geology that uses the relative abundances of isotopes within geological materials to understand the Earth's systems and history.
• isotopic number

  nounC2
  /ˌaɪ.səˈtɒp.ɪk ˈnʌm.bər/A numerical quantity equal to the difference between the number of neutrons and the number of protons in an atomic nucleus (N − Z).
• isotopic spin

  nounRare (C2+)
  /ˌaɪ.səˌtɒp.ɪk ˈspɪn/A quantum number in particle physics used to classify nucleons (protons and neutrons) and their interactions, treating them as different states of a single particle.
• isotopy

  nounC2
  /aɪˈsɒtəpi/A concept describing semantic consistency or uniformity across different elements of a text.
• isotretinoin

  nounC1
  /ˌaɪsəʊtrəˈtɪnəʊɪn/A powerful oral retinoid medication derived from vitamin A, used primarily to treat severe, treatment-resistant acne.
• isotron

  nounVery low
  /ˈaɪsəʊtrɒn/A device for separating isotopes, especially by electromagnetic means.
• isotype

  nounC2
  /ˈaɪsə(ʊ)taɪp/A graphic symbol or pictorial representation used to convey statistical or complex information quickly and clearly without words, such as in an infographic.
• isoxsuprine

  nounVery Low
  /aɪˈsɒks.sjuː.priːn/A medication primarily used to treat peripheral vascular disease and certain circulatory conditions.
• isozyme

  nounVery Low
  /ˈaɪ.səʊ.zaɪm/A distinct molecular form of an enzyme that catalyzes the same biochemical reaction but differs in amino acid sequence and may have different kinetic properties.
• ispaghula

  nounVery low frequency (specialized/technical)
  /ˌɪspəˈɡuːlə/A plant whose seeds or husks are used as a bulk-forming laxative.
• ispahan

  nounLow
  /ˌɪsfəˈhɑːn/A city in central Iran, historically a major cultural and economic center, also spelled Isfahan.
• israel

  nounB2
  /ˈɪz.reɪ.əl/A country in the Middle East, located on the southeastern shore of the Mediterranean Sea.
• israel ben eliezer

  nounLow frequency; primarily encountered in religious, historical, or Jewish studies contexts.
  /ˈɪz.reɪ.əl bɛn ˌɛ.liˈeɪ.zə/Proper name of an 18th-century Jewish religious leader, founder of Hasidic Judaism.
• israeli

  adjectivenounC1
  /ɪzˈreɪ.li/A person from the modern state of Israel, or pertaining to Israel as a nation.
• israeli couscous

  nounB2
  /ɪzˌreɪ.li ˈkuːs.kuːs/A type of small, toasted pasta balls made from semolina flour, larger than traditional couscous, with a nutty flavor and chewy texture.

Showing 3441–3460 of 3621 words.