English Words Starting With I

• isopectic

  nounVery low (extremely specialized)
  /ˌaɪsə(ʊ)ˈpɛktɪk/A line on a map connecting points at which ice forms at the same time of year.
• isopedin

  nounObscure/Technical
  /ˌaɪsəʊˈpiːdɪn/A type of internal bony layer found in the scales of certain primitive fishes, especially ganoid fishes.
• isoperimeter

  nounVery Low
  /ˌaɪ.səʊ.pəˈrɪm.ɪ.tər/A figure or set of figures having the same perimeter.
• isoperimetry

  nounVery Low (Technical/Specialist)
  /ˌaɪ.səʊ.pəˈrɪm.ɪ.tri/The mathematical property of having equal perimeters or boundary lengths.
• isophone

  nounC1
  /ˈaɪ.sə(ʊ).fəʊn/A line on a map connecting points where a particular linguistic feature (especially a phonetic or phonological one) is used.
• isophote

  nounVery Rare / C2+
  /ˈʌɪsə(ʊ)fəʊt/A line or contour on a map, chart, or image connecting points of equal light intensity or brightness.
• isophthalic acid

  nounVery low
  /ˌaɪ.səʊˈθæl.ɪk ˈæs.ɪd/An aromatic dicarboxylic acid used primarily in the production of polyesters, resins, and plasticizers.
• isoplastic graft

  nounVery Low
  /ˌaɪ.səʊˈplæs.tɪk ɡrɑːft/A tissue graft where the donor and recipient are genetically identical members of the same species, such as identical twins.
• isopleth

  nounLow
  /ˈaɪ.səʊ.pleθ/A line on a map connecting points where a particular variable (e.g., temperature, pressure, population density) has the same value.
• isopod

  adjectivenounC2
  /ˈaɪ.sə.pɒd/A small, mostly aquatic crustacean with a flattened body and seven pairs of legs.
• isopolity

  nounVery low / Archaic / Technical
  /ˌaɪsəʊˈpɒlɪti/a form of mutual citizenship or equal political rights granted between two or more city-states or political entities, typically in the ancient Greek world.
• isopor

  nounLow / Regional
  /ˈʌɪsə(ʊ)pɔː/A lightweight, rigid, synthetic material, typically made from expanded polystyrene foam, used primarily for insulation and as a protective packaging material.
• isoprene

  nounC2
  /ˈaɪsə(ʊ)priːn/A colourless volatile liquid hydrocarbon, C5H8, used chiefly in the production of synthetic rubber.
• isopropanol

  nounC2
  /ˌaɪ.səʊˈprəʊ.pə.nɒl/A colorless, flammable secondary alcohol with a strong odor, used as a solvent and in antiseptics.
• isopropyl

  adjectivenounC1/C2 (Specialist)
  /ˌaɪ.səʊˈprəʊ.pɪl/A chemical group derived from propane, consisting of three carbon atoms with the middle one bonded to a hydroxyl (OH) group, formula (CH₃)₂CH–.
• isopropyl alcohol

  nounC1
  /ˌaɪ.səʊˌprəʊ.pɪl ˈæl.kə.hɒl/A colourless, flammable chemical compound with a strong odour, used as a solvent and disinfectant.
• isopropyl ether

  nounTechnical
  /ˌaɪsəʊˈprəʊpɪl ˈiːθə/A chemical compound with the formula (CH₃)₂CHOCH(CH₃)₂, also known as diisopropyl ether, used primarily as an organic solvent.
• isopropyl group

  nounLow
  /ˌaɪsə(ʊ)ˈprəʊpɪl ɡruːp/A functional group in organic chemistry consisting of three carbon atoms and seven hydrogen atoms arranged as (CH3)2CH−, derived from propane by removing one hydrogen atom from the central carbon.
• isopropylbenzene

  nounC2
  /ˌʌɪsəʊˌprəʊpɪlˈbɛnziːn/A colourless flammable liquid aromatic hydrocarbon with the chemical formula C9H12, used as a solvent and chemical intermediate.
• isopropylideneacetone

  nounVery Rare
  /ˌaɪsəʊˌprəʊpɪlɪˌdiːnˈæsɪtəʊn/A specific chemical compound, also known as mesityl oxide, used as a solvent and intermediate in organic synthesis.

Showing 3401–3420 of 3621 words.