English Words Starting With A

• actinin

  nounRare
  /ækˈtɪnɪn/A protein found in muscle and other cell types that binds to actin filaments, playing a crucial role in cell structure and movement.
• actinism

  nounVery Low (Technical)
  /ˈæk.tɪ.nɪ.zəm/The property of solar radiation, especially ultraviolet radiation and blue light, that causes chemical changes, as in photography or fading.
• actinium

  nounC2
  /akˈtɪn.i.əm/A radioactive metallic chemical element with the symbol Ac and atomic number 89.
• actinium series

  nounC2
  /akˈtɪn.i.əm ˈsɪə.riːz/The series of radioactive isotopes beginning with uranium-235 (actinouranium) and ending with stable lead-207.
• actinobacillosis

  nounVery Low / Technical
  /ˌæktɪnəʊˌbæsɪˈləʊsɪs/A chronic, granulomatous disease primarily affecting cattle and other livestock, caused by bacteria of the genus Actinobacillus.
• actinobacillus

  nounC2 (Very Low Frequency - Specialized Technical)
  /ˌaktɪnəʊbəˈsɪləs/A genus of gram-negative, non-motile, rod-shaped bacteria, often found in animals and occasionally humans, some species of which are pathogenic.
• actinobiology

  nounVery Low
  /ˌaktɪnəʊbʌɪˈɒlədʒi/The branch of biology concerned with the effects of radiation on living organisms.
• actinochemistry

  nounVery low
  /ˌaktɪnəʊˈkɛmɪstri/The branch of chemistry that deals with the chemical effects of light and other forms of radiant energy.
• actinodermatitis

  nounVery Rare
  /ˌaktɪnəʊˌdɜːməˈtaɪtɪs/Inflammation of the skin caused by exposure to radiation (especially sunlight or X-rays).
• actinogram

  nounExtremely rare (C2+ / specialist)
  /ækˈtɪn.ə.ɡræm/A recording or tracing produced by an actinograph (an instrument for measuring radiation, especially sunlight).
• actinograph

  nounC2
  /akˈtɪn.ə.ɡrɑːf/An instrument for measuring and recording the intensity of radiation, especially sunlight.
• actinolite

  nounC2/Highly Specialised
  /ækˈtɪn.ə.laɪt/A green, fibrous, or needle‑like mineral belonging to the amphibole group, primarily composed of calcium, magnesium, and iron silicates.
• actinology

  nounVery Low (Obsolete/Highly Specialized)
  /ˌæktɪˈnɒlədʒi/The scientific study of the chemical effects of light, particularly ultraviolet radiation.
• actinomere

  nounVery Rare / Technical
  /ˈæktɪnə(ʊ)ˌmɪə/A segment or division of the body in radially symmetrical animals, such as certain coelenterates and echinoderms.
• actinometer

  nounVery Low
  /ˌæktɪˈnɒmɪtə/A scientific instrument for measuring the intensity of radiation, especially sunlight.
• actinomyces

  nounVery Low
  /ˌaktɪnə(ʊ)ˈmʌɪsiːz/A genus of filamentous, gram-positive bacteria, often found in soil and part of the normal oral and gut flora of mammals; some species can cause chronic infections in humans and animals.
• actinomycete

  nounC2 (Very Low Frequency)
  /ˌaktɪnəʊˈmʌɪsiːt/A type of filamentous, gram-positive bacterium, often found in soil, that can resemble fungi in its growth pattern and is noted for producing many antibiotics.
• actinomycin

  nounRare
  /ˌaktɪnə(ʊ)ˈmʌɪsɪn/A class of antibiotics produced by bacteria of the genus Streptomyces, known for their ability to inhibit DNA transcription.
• actinomycosis

  nounC2
  /ˌaktɪnə(ʊ)mʌɪˈkəʊsɪs/A chronic bacterial infection caused by Actinomyces species, typically affecting the face, neck, or lungs.
• actinon

  nounVery Low
  /ˈæktɪnɒn/A chemical isotope of radon (Rn-219) which is part of the actinium radioactive decay series.

Showing 1021–1040 of 8734 words.