actino-, actin-, actini-, -actinal, actis- +

(Greek: ray [as of light] or like a ray in form; radiance, radiation; a radiating or tentacled structure)

Having radiately arranged genital organs.
An obsolete synonym for a radiograph.
1. An instrument, invented by Sir J. Herschel in 1838, for recording the variations in the power of the solar rays.
2. An instrument (of which there are various kinds) used for recording actinic power of light, to determine the correct time of exposure for photographic plates.
3. Either seldom used terms, or obsolete terms, for radiograph and radiography (images produced on film or another sensitive surface by radiation; such as, X-rays or gamma rays passing through an object).
A red respiratory pigment found in certain forms of Actina (sea anemones).
Rayed; star-shaped or stellate.
A bright green variety of amphibole occurring usually in fibrous or columnar masses.

Amphibole refers to a hydrous silicate mineral containing varying amounts of aluminum, calcium, iron, magnesium, and sodium

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.

actinology (s) (noun)
1. The science of photochemistry or the science of the chemical effects of light.
2. The study of radiant energy.
3. The study of homology of successive regions, segments, or parts of a radially symmetric organ or organism radiating from a common central region.
1. A device which generates ultraviolet rays, as in actinotherapy.
2. Any substance which undergoes a rather marked change when exposed to light.
One of the radial segments composing the body of one of the Coelenterata (one of the major phyla of invertebrates, to which such forms as jellyfish belong).
1. An instrument for measuring the intensity and penetrating power of actinic rays.
2. A device for measuring light energy; especially, solar and terrestrial radiation.
3. An instrument for measuring the intensity of radiation by measuring the fluorescence prodced by it.
actinometer, actinometry
1. An apparatus for determining the intensity of actinic rays.
2. A device which determines the degree of penetration of such rays.
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.
1. Measurement of light energy in photochemistry.
2. Measurement of solar energy.
A reference to having radial symmetry, as a flower or a starfish.