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

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

actinobiology (s) (noun) (no pl)
The study of the effects of radiation on living organisms; radiation biology: Actinobiology, the science concerning the action of ionising radiation on living creatures, is especially concerned with the effects of this on living creatures.
actinoblast (s) (noun), actinoblasts (pl)
The mother cell from which a spicule (small needle-like structure or part) is developed: An actinoblast forms each ray of a sponge's radiate spicule, called a "scleroblast".

The sponges are members of the phylum Porifera.

actinocarpic (adjective), more actinocarpic, most actinocarpic
A reference to plants with flowers radially arranged: Actinocarpic vegetation or plants have the placentas radiate from the center of the axis of the fruit.
actinocarpous (adjective), more actinocarpous, most actinocarpous
Plants with flowers and fruit radially arranged: There are many kinds of actinocarpous plants and among them are the Pelargonium and the Mimosa pudica.
actinochemical (adjective) (not comparable)
A reference to the various effects produced by visible radiation: Actinochemical force of the sun's rays are different from light and heat.

One component of an actinochemical effect of a sunbeam is its ability to cause a chemical reaction.

actinochemistry (s) (noun) (no pl)
The branch of chemistry that is concerned with the various effects produced by visible radiation; photochemistry: Actinochemistry deals with chemical reactions produced by light or other radiation.
actinocongestin, congestin (s) (noun) (no pl)
A highly poisonous substance derived from the tentacles of the sea anemone: Actinocongestin can produce extensive dilatation of the splanchnic (internal organs collectively) vessels and hemorrhages when injected into laboratory animals.
actinocutitis (s) (noun) (no pl)
Radio or radiation dermatitis (skin inflammation): Acrinocurtitis is a photosensitive dermopathy that appears in all races and mainly with older men.
actinodermatitis (s) (noun), actinodermatitises: actinodermatitides (pl)
An inflammation of the skin: Actinodermatitis is an ailment of the epidermis resuling from too much exposure to sunlight or because of an adverse reaction to a radiation-skin therapy.

Actinodermatitis is also caused by exposure to some form of radiation, such as ultraviolet light or X-rays.

actinodrome (adjective) (not comparable)
A reference to a leaf which is palmately veined: Grace saw many photos of actinodrome foliage of plants in her botany book and thought such a plant would look quite nice in her living room at home.

An actinodrome form radiates like a shape similar to that of a hand with the fingers extended.

actinodromous (adjective) (not comparable)
Veined like a hand with the fingers extended: Little Jane drew a picture of a plant with actinodromous leaves which was quite similar to all of little Jane's fingers spread apart.
actinogen (s) (noun), actinogens (pl)
A substance that produces radiation: The radiogenic substance actinogen is one of the radioactive chemical elements.
actinogenesis (s) (noun), actinogeneses (pl)
The production of radiation; radiogenesis: Actinogenesis is the formation of rays or of radiation, especially ionising radiation.
actinogenic (adjective). more actinogenic, most actinogenic
Referring to the production of radiation: Actinogenic formation of rays or radiation is especially exemplified by ionising radiation.
actinogenics (s) (noun) (no pl)
The science of radiation: Tom's father worked in the area of actinogenics which had to do with different kinds of rays, like ionising radiation and electromagnetic waves.