You searched for: “actinic
actinic (adjective)
1. A reference to radiation; such as, sunlight or x-rays: "Sunburn is an actinic burn while actinic keratosis is a skin lesion that is caused by chronic sun exposure."
2. Possessing photochemical properties.
3. Pertaining to or designating radiant energy: "An actinic ray exists in the visible and ultraviolet spectrum which produces marked chemical changes."
This entry is located in the following units: actino-, actin-, actini-, -actinal, actis- + (page 1) -ic (page 5)
Word Entries containing the term: “actinic
actinic burn (s), actinic burns (pl) (nouns)
A burn, or burns, caused by exposure to sunlight or another source of ultraviolet radiation.
This entry is located in the following unit: actino-, actin-, actini-, -actinal, actis- + (page 1)
actinic carcinoma (s); actinic carcinomas, actinic carcinomata (pl) (nouns)
A basal cell or squamous cell cacinoma of the face and other exposed surfaces of the body, seen in people who spend prolonged periods of time in direct sunlight.
This entry is located in the following units: actino-, actin-, actini-, -actinal, actis- + (page 1) -ic (page 5)
actinic conjunctivitis (s) (noun); actinic conjunctivitides, actinic conjunctivitises (pl)
An inflammation of the conjunctiva (transparent membrane covering the eyeball): "Actinic conjunctivitis can be caused by exposure to the ultraviolet radiation of sunlight or other sources; such as, exposure to acetylene torches, therapeutic lamps (sun lamps), and klieg lights (powerful carbon-arc lamps producing intense light and used especially in making movies)."

"Actinic is a term for ultraviolet (UV) rays from sunlight and UV lamps."

This entry is located in the following units: actino-, actin-, actini-, -actinal, actis- + (page 1) -ic (page 5) junct-, jug-, join- (page 1)
actinic dermatitis (s); actinic dermatitises, actinic dermatitides (pl) (nouns)
A skin inflammation or rash resulting from exposure to sunlight, X-rays, or atomic particle radiation: Chronic or recurrent actinic dermatitis can lead to skin cancer.
actinic keratoconjunctivitis (s) (noun), actinic keratoconjunctivitises (pl)
Inflammation of the conjunctiva and cornea with pain, photophobia, lacrimation, and smarting of the lids caused by repeated flashes of bright light or ultraviolet radiation.
This entry is located in the following units: actino-, actin-, actini-, -actinal, actis- + (page 1) junct-, jug-, join- (page 1)
actinic keratoses, solar keratoses, senile keratosis, senile wart
1. A focal, scaly excrescence on the scalp, face, neck, or other exposed surface of skin resulting, at least partially, from long exposure to the ultraviolet rays of the sun: "These actinic keratoses or solar keratoses are growths that are usually pink or red and appear as flaky, rough scaly patches or areas of skin and they may also be light gray or brown and feel hard, rough, or gritty.
2. Actinic keratoses (solar keratoses) are precancerous growths caused by long-term sun exposure.
3. Etymology: actinic is from Greek aktis, "ray" and refers to the ultraviolet rays, as in sunlight, that can cause reaction in the skin; so, a "sunbrn" is an actinic injury while keras is a Greek element for "horn".

Solar keratoses, or senile keratosis, is more common with fair skinned and elderly people and it may be a discrete, slightly raised, red-on-pink lesion located on a sun-exposed surface.

Such conditions can be prevented by decreasing oneself to sun exposure and by wearing sunscreen.

Actinic keratoses usually can be removed by freezing with liquid nitrogen (cryotherapy); however, if a person has too many growths, a liquid or cream containing fluorouracil may be applied.

Often, during such treatment, the skin temporarily looks worse because fluorouracil causes redness, scaling, and burning of the keratoses and of the surrounding sun-damaged skin.

A relatively new drug, imiquimod, is useful in treating actinic keratoses because it helps the immune system to recognize and to destroy cancerous skin growths.

Another treatment includes cutting the keratoses away, by burning them with photodynamic therapy; that is, injecting into the bloodstream a chemical that collects in actinic keratoses and makes them more sensitive to destruction by a specialized form of light.

—Partially compiled from excerpts found in
Webster's New World Medical Dictionary; Wiley Publishing, Inc.;
Hoboken, New Jersey; 2008; page 6.
This entry is located in the following unit: actino-, actin-, actini-, -actinal, actis- + (page 1)
prurigo aestivalis, actinic prurigo, summer prurigo
An itching which returns each summer, becoming very severe as long as the hot weather continues.
This entry is located in the following unit: pruri-, prur-, prurit- + (page 1)