English Words Starting With H

• hydromulch

  verb-transitiveC2 (Very Low Frequency - Highly specialized)
  /ˈhaɪ.drəʊ.ˌmʌltʃ/A slurry mixture of water, mulch (often paper or wood fiber), seed, and sometimes fertilizer, sprayed onto soil to aid in erosion control and seed germination.
• hydronaut

  nounVery Low (Highly specialised technical term)
  /ˈhaɪ.drəʊ.nɔːt/An explorer or researcher who operates and lives in an underwater environment, analogous to an astronaut in space.
• hydronephrosis

  nounLow (Technical)
  /ˌhaɪ.drəʊ.nɪˈfrəʊ.sɪs/An abnormal swelling of a kidney caused by a blockage in the urinary tract.
• hydronitrogen

  nounTechnical
  /ˌhaɪdrəʊˈnaɪtrədʒən/A compound or substance containing hydrogen and nitrogen atoms.
• hydronium ion

  nounC2
  /haɪˈdrəʊ.ni.əm ˈaɪ.ɒn/The positively charged ion H₃O⁺, formed by the association of a proton (H⁺) with a water molecule, the primary form of acid in aqueous solution.
• hydropac

  nounVery Low (Technical/Trademark)
  /ˈhaɪ.drəʊ.pæk/A proprietary or trademarked name for a type of water-resistant packaging or irrigation device.
• hydropathy

  nounC2
  /haɪˈdrɒpəθi/A treatment system for illness that uses water, either internally or externally.
• hydroperoxide

  nounC2 (Very Low Frequency - Technical)
  /ˌhaɪdrəʊpəˈrɒksaɪd/A chemical compound containing the -OOH group, an unstable intermediate in oxidation reactions.
• hydrophane

  nounVery Rare / Technical
  /ˈhaɪdrə(ʊ)feɪn/A variety of opal that becomes translucent or transparent when soaked in water.
• hydrophilic

  adjectivenounC1
  /ˌhʌɪ.drə(ʊ)ˈfɪl.ɪk/Having a strong affinity for water; readily absorbing or mixing with water.
• hydrophobe

  nounC1/C2
  /ˈhʌɪdrə(ʊ)fəʊb/A substance that repels or fails to mix with water; a molecule or surface that is water-repellent.
• hydrophobia

  nounC1/C2
  /ˌhʌɪdrə(ʊ)ˈfəʊbɪə/An extreme, irrational fear of water.
• hydrophone

  nounLow (Technical term)
  /ˈhaɪ.drə.fəʊn/A device for listening to sound waves traveling through water, used especially to detect or locate objects underwater.
• hydrophyte

  nounC2
  /ˈhaɪ.drəʊ.faɪt/A plant that grows in water or very wet soil.
• hydroplane

  nounverbverb-intransitiveC1
  /ˈhaɪ.drəʊ.pleɪn/(n) A fast, flat-bottomed motorboat designed to skim over the surface of water. (v) To slide uncontrollably on a wet road surface; to skid due to water between tyres and road.
• hydroplaner

  nounVery Low / Technical
  /ˈhaɪ.drəʊˌpleɪ.nə/A person or vehicle that hydroplanes, or specifically a type of boat designed to plane across water.
• hydropneumatization

  nounExtremely Rare / Obscure
  /ˌhaɪ.drəʊ.njuː.mə.taɪˈzeɪ.ʃən/The process of replacing bone tissue with air-filled and sometimes fluid-containing spaces.
• hydroponics

  nounC1
  /ˌhaɪ.drəʊˈpɒn.ɪks/A method of growing plants without soil, using mineral nutrient solutions dissolved in water.
• hydropower

  nounC1-C2
  /ˈhaɪ.drəʊˌpaʊə(r)/Electricity generated using the energy of moving water, typically from dams.
• hydrops

  nounVery Rare (Specialist)
  /ˈhaɪdrɒps/The pathological accumulation of excess fluid in body tissues or cavities; edema or dropsy.

Showing 5521–5540 of 5990 words.