*actin*

a. [ Gr. &unr_;, &unr_;, ray. ] (Zool.) Pertaining to the part of a radiate animal which contains the mouth. L. Agassiz. [ 1913 Webster ]

‖n. pl. [ NL., from Gr. &unr_;, &unr_;, ray. ] (Zool.) An order of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not. [ 1913 Webster ]

a. 1. Operating in any way. [ 1913 Webster ]

2. Doing duty for another; officiating; as, an acting superintendent. [ 1913 Webster ]

‖n.; pl. L. Actiniæ E. Actinias [ Latinized fr. Gr. &unr_;, &unr_;, ray. ] (Zool.) (a) An animal of the class Anthozoa, and family Actinidæ. From a resemblance to flowers in form and color, they are often called animal flowers and sea anemones. [ See Polyp. ]. (b) A genus in the family Actinidæ. [ 1913 Webster ]

n. 1. any sea anemone or related animal.
Syn. -- actinia, actiniarian [ WordNet 1.5 ]

n. 1. 1 the order comprising sea anemones.
Syn. -- order Actiniaria, Actinaria, order Actinaria [ WordNet 1.5 ]

n. 1. any sea anemone or related animal.
Syn. -- actinia, actinian [ WordNet 1.5 ]

a. Of or pertaining to actinism; as, actinic rays. [ 1913 Webster ]

n. 1. 1 a small Asiatic woody vine bearing many-seeded fruit.
Syn. -- genus Actinidia. [ WordNet 1.5 ]

n. 1. 1 tropical trees or shrubs or woody vines.
Syn. -- family Actinidiaceae [ WordNet 1.5 ]

a. [ Gr. &unr_;, &unr_;, ray + -form. ] Having a radiated form, like a sea anemone. [ 1913 Webster ]

n. 1. 1 a genus of terrestrial ferns of tropical Asia and Africa.
Syn. -- genus Actiniopteris. [ WordNet 1.5 ]

n. [ Gr. &unr_;, &unr_; ray. ] The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, ray. ] (Chem.) A supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light. [ 1913 Webster ]

n. Chemistry in its relations to actinism. Draper. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, ray + -gram. ] A record made by the actinograph.
[ Obsolescent ] [ Webster 1913 Suppl. ]

n. [ Gr. &unr_;, &unr_;, ray + -graph. ] An instrument for measuring and recording the variations in the actinic or chemical force of rays of light. Nichol. [ 1913 Webster ]

a. [ Gr. &unr_;, &unr_;, ray + -oid. ] Having the form of rays; radiated, as an actinia. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, ray + -lite. ] (Min.) A bright green variety of amphibole occurring usually in fibrous or columnar masses. [ 1913 Webster ]

a. (Min.) Of the nature of, or containing, actinolite. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, ray + -logy. ] The science which treats of rays of light, especially of the actinic or chemical rays. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, ray + &unr_; part. ] (Zool.) One of the radial segments composing the body of one of the Cœlenterata. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, ray + -meter ] (a) An instrument for measuring the direct heating power of the sun's rays. (b) An instrument for measuring the actinic effect of rays of light. [ 1913 Webster ]

a. Pertaining to the measurement of the intensity of the solar rays, either (a) heating, or (b) actinic. [ 1913 Webster ]

n. 1. The measurement of the force of solar radiation. Maury. [ 1913 Webster ]

2. The measurement of the chemical or actinic energy of light. Abney. [ 1913 Webster ]

n. 1. 1 filamentous or rod-shaped bacteria.
Syn. -- order Actinomycetales [ WordNet 1.5 ]

n. 1. branched gram-positive bacteria, often found in soil, some of which are pathogenic for humans and animals. some species have been found to produce metabolites which are useful in medicine. Many species of these bacteria have been isolated and extensively screened by pharmaceutical companies and university research groups for production of useful therapeutic agents. Among the agent produced by actinomycetes are tetracyclines, streptomycin, avermectin, and thienamycin [ WordNet 1.5 ]

adj. 1. of or pertaining to actinomycetes.
Syn. -- actinomycetal [ WordNet 1.5 ]

n. [ From actinomyces, the genus of the organism in which they were first found. ] 1. any of various red antibiotics isolated from soil bacteria with a three-ring heterocyclic nucleus with an attached peptide chain. Actinomycin D is the most well-known and has been used to treat certain tumors. They act by binding to DNA and inhibiting the transcription of RNA. Their binding to DNA has been much studied.
Syn. -- actinomycin actinomycin C actinomycin F1 actinomycin D [ WordNet 1.5 ]

n. [ From actinomyces, the genus of the organism in which they were first found. ] The most well-known of the actinomycins (C62H86N12O16), a class of antibiotics which act by binding to DNA and inhibiting synthesis of RNA; they act agains gram-positive bacteria and many eukaryotic organisma. Actinomycin D has been used in human medicine to treat certain tumors.
Syn. -- dactinomycin, actinomycin IV, Cosmegen[ trade name ], actinomycin C1, actinomycin I1 [ PJC ]

n. [ NL. ] (Med.) A chronic infectious disease of cattle and man due to infection with actinomycetes, especially by Actinomyces bovis in cattle and by Actinomyces israeli or Arachnia propionica in man. It is characterized by hard swellings usually in the mouth and jaw. In man the disease may also affect the abdomen or thorax. In cattle it is called also lumpy jaw or big jaw. [ Webster 1913 Suppl. + AS ]

adj. (Med.) Of or pertaining to actinomycosis. [ WordNet 1.5 ]

n. 1. an order comprising parasites of worms.
Syn. -- order Actinomyxidia. [ WordNet 1.5 ]

n. 1. a type of parasite of worms. [ WordNet 1.5 ]

n. [ Gr. &unr_;, &unr_;, ray + &unr_; voice. ] (Physics) An apparatus for the production of sound by the action of the actinic, or ultraviolet, rays. [ Webster 1913 Suppl. ]

a. (Physics) Pertaining to, or causing the production of, sound by means of the actinic, or ultraviolet, rays; as, actinophonic phenomena. [ Webster 1913 Suppl. ]

a. [ Gr. &unr_;, &unr_;, ray + fe`rein to bear. ] Having straight projecting spines. [ 1913 Webster ]

n. 1. protozoa having stiff rodlike radiating pseudopods. [ WordNet 1.5 ]

n. 1. 1 heliozoans; radiolarians.
Syn. -- subclass Actinopoda [ WordNet 1.5 ]

n. [ Gr. &unr_; ray + &unr_; body. ] (Zool.) The entire body of a cœlenterate. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, ray + &unr_; bone. ] (Anat.) One of the bones at the base of a paired fin of a fish. [ 1913 Webster ]

n. [ Gr. &unr_;, &unr_;, a ray + &unr_; mouth. ] (Zool.) The mouth or anterior opening of a cœlenterate animal. [ 1913 Webster ]

‖n. pl. [ NL.; Gr. &unr_;, &unr_;, a ray + &unr_; a ring. ] (Zool.) A peculiar larval form of Phoronis, a genus of marine worms, having a circle of ciliated tentacles. [ 1913 Webster ]

‖n. pl. [ Gr. &unr_;, &unr_;, ray + zw^, on animal. ] (Zool.) A group of Cœlenterata, comprising the Anthozoa and Ctenophora. The sea anemone, or actinia, is a familiar example. [ 1913 Webster ]

a. (Zool.) Of or pertaining to the Actinozoa. [ 1913 Webster ]

‖n. (Zool.) One of the Actinozoa. [ 1913 Webster ]

‖n. pl. [ NL., fr. Gr. &unr_;, &unr_;, a ray. ] (Zool.) A kind of embryo of certain hydroids (Tubularia), having a stellate form. [ 1913 Webster ]

a. [ Pref. a- not + diactinic. ] (Chem.) Not transmitting the actinic rays. [ 1913 Webster ]