(Greek: a suffix; pertaining to; of the nature of, like; in chemistry, it denotes a higher valence of the element than is expressed by -ous)

1. Ovariole having nutritive cells at the apex which are joined to oocytes by nutritive cords.
2. In zoology, Having the vitelligenous cells grouped at the apex; said of the meroistic ovariole of certain insects.
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."
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.
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."

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.
A reference to plants with flowers radially arranged.
Producing radiation.
Of the nature of, or containing, actinolite (bright green variety of amphibole occurring usually in fibrous or columnar masses).

Amphibole is any of a complex group of hydrous silicate minerals, containing chiefly calcium, magnesium, sodium, iron, and aluminum, and including hornblende, tremolite, asbestos, etc., occurring as important constituents of many rocks.

1. Pertaining to the measurement of the intensity of the solar rays, either (a) heating, or (b) actinic.
2. A reference to any of several radiometric instruments; such as, a pyrheliometer, used chiefly for meteorological measurements of terrestrial and solar radiation.
A reference to having radial symmetry, as a flower or a starfish.
Capable of being divided into equal halves along any diameter, as the flowers of the rose or tulip; radially symmetrical.
Relating to actinomycosis or characterized by an inflammatory disease of cattle, hogs, and sometimes humans, caused by microorganisms of the genus Actinomyces and characterized by lumpy tumors of the mouth, neck, chest, and abdomen.
actinophonic (adjective), more actinophonic, most actinophonic
A reference to sounds that are produced by chemical action.