English Words Starting With I

• infrared astronomy

  nounLow
  /ˌɪn.frəˈred əˈstrɒn.ə.mi/The branch of astronomy that studies astronomical objects through the detection and analysis of infrared radiation (heat energy) they emit or reflect.
• infrared galaxy

  nounC2 (Very Low Frequency)
  /ˌɪn.frəˈred ˈɡæl.ək.si/A galaxy that emits most of its energy in the infrared part of the electromagnetic spectrum.
• infrared photography

  nounC1
  /ˌɪn.frəˈred fəˈtɒɡ.rə.fi/A photographic technique that captures images using infrared light, which is beyond the visible spectrum.
• infrared star

  nounC2/Technical
  /ˌɪn.frəˈred stɑː/A star whose light output is primarily in the infrared part of the electromagnetic spectrum, often due to being very cool or obscured by dust.
• infrasonics

  nounRare / Technical
  /ˌɪn.frəˈsɒn.ɪks/The study or science of sound waves with frequencies below the lower limit of human audibility, typically below 20 Hz.
• infrasound

  nounC2
  /ˈɪnfrəsaʊnd/Sound waves with frequencies below the lower limit of human hearing (approximately 20 hertz).
• infrastructure

  nounC1
  /ˈɪnfrəˌstrʌktʃə(r)/The basic physical and organizational structures and facilities (e.g., buildings, roads, power supplies) needed for the operation of a society or enterprise.
• infrequency

  nounC2 / Very Low
  /ˌɪnˈfriː.kwən.si/The state or condition of happening or appearing very rarely or not often.
• infringe

  verbverb-intransitiveverb-transitiveC1
  /ɪnˈfrɪndʒ/To actively break the terms of a law, agreement, rule, or right.
• infringed

  adjectiveverbC1/C2
  /ɪnˈfrɪndʒd/to break or violate (a law, agreement, rule, or right)
• infringement

  nounC1
  /ɪnˈfrɪndʒmənt/The act of breaking a law, rule, or agreement; a violation.
• infula

  nounExtremely Rare / Archaic / Specialized
  /ˈɪnfjʊlə/A headband, ribbon, or fillet; specifically, in ancient times, one of the two ribbons attached to the back of a bishop's mitre or other ceremonial headdress.
• infulae

  plural-nounRare/Obsolescent
  /ˈɪnfjʊliː/ribbons, often white and red, attached to ceremonial headdresses, especially in ancient Roman and Jewish priestly contexts; also, the two pendants on a bishop's mitre.
• infundibulum

  nounLow/Very Low
  /ˌɪnfʌnˈdɪbjʊləm/A funnel-shaped anatomical structure or passage.
• infuriate

  adjectiveverbverb-transitiveC1
  /ɪnˈfjʊə.ri.eɪt/to make (someone) extremely angry; to enrage.
• infuse

  verbverb-intransitiveverb-transitiveC1
  /ɪnˈfjuːz/To fill something with a particular quality, emotion, or substance; to steep something in liquid to extract its flavour or properties.
• infuser

  nounB2
  /ɪnˈfjuː.zə(r)/A device or object that allows a substance (such as tea leaves, herbs, or flavorings) to be steeped or immersed in a liquid, typically hot water, to transfer its flavour, aroma, or beneficial properties.
• infusion

  nounB2
  /ɪnˈfjuːʒ(ə)n/The process of introducing or adding something (such as a substance, idea, or quality) into something else, often to strengthen or enhance it; also, the liquid resulting from steeping a substance (like tea or herbs) in water.
• infusionism

  nounVery Low / Technical
  /ɪnˈfjuːʒənɪz(ə)m/A philosophical or artistic belief in the transformative power of infusing one substance or quality into another to create new meaning or value.
• infusoria

  plural-nounVery Low
  /ˌɪnfjuːˈzɔːriə/A historical taxonomic category for minute, free-swimming organisms found in infusions of decaying organic matter, particularly microscopic protozoans and algae.

Showing 1701–1720 of 3621 words.