from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of, relating to, resulting from, or showing actinism.

from The Century Dictionary.

  • Pertaining to actinism; having the property of actinism.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Of or pertaining to actinism.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Of, or relating to actinism

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective relating to or exhibiting actinism


from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek ἀκτίς, ἀκτῖν- (actis, actin-, "ray") +‎ -ic


  • Thus from the work of Hertz and his successors we know that light, and more particularly what we call actinic light, is an effective means of setting free electrons from certain substances.

    The Birth-Time of the World and Other Scientific Essays

  • The analogy, though imperfect, is that some early skin cancers are called "actinic keratoses" and early cervical cancers are termed "dysplasias."


  • In addition to early squamous cell carcinomas — a cancer that's usually curable — he has been treated for half a dozen of these precancers, called actinic keratoses.

    Doctors can treat skin precancer before it turns deadly

  • He sees many patients with a condition known as actinic keratosis—small, rough, raised areas on the skin that can develop into squamous cell carcinoma, a cancer that in turn can spread to internal organs and be life-threatening.

    Reckoning With the Sun

  • Most important, retinoids decrease things called actinic keratoses that can become skin cancer.

    You Being Beautiful

  • Now, her husband has had four precancerous lesions, called actinic keratosis, taken off of his face.

    CNN Transcript Dec 19, 2006

  • From the least to the most dangerous, they are: basal cell carcinoma (or basal cell carcinoma epithelioma) squamous cell carcinoma (the first stage of which is called actinic keratosis) melanoma

    Recently Uploaded Slideshows

  • From the least to most dangerous, skin cancer refers to three different conditions: basal cell carcinoma, squamous cell carcinoma (the first stage of which is called actinic keratosis) and melanoma.

    Recently Uploaded Slideshows

  • The one found on the lips, called actinic cheilitis, could evolve into a type of squamous cell skin cancer that can spread rapidly to other parts of the body. New Blogs and RSS Feeds

  • Fluorouracil ointment reduced potentially cancerous skin patches called actinic keratoses.

    The Independent - Frontpage RSS Feed


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  • I learned this word from the novels of Janny Wurts.

    December 2, 2006