| actinic prurigo | A form recurring each summer, becoming very severe as long as the hot weather continues. Synonym: actinic prurigo, summer prurigo. (05 Mar 2000) |
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| actinic ray | A light ray toward and beyond the violet end of the spectrum that acts upon a photographic plate and produces other chemical effects. Synonym: chemical ray. (05 Mar 2000) |
| actinic reticuloid | Chronic pruritic erythema beginning on sun-exposed areas in elderly males, with marked thickening and ridging of exposed skin simulating lymphoma; there is infiltration by atypical CD8-positive T lymphocytes. Occurs after several years. (05 Mar 2000) |
| actinide | <chemistry> Any element in the periodic table which has an atomic number between 89 and 103. (09 Oct 1997) |
| actinide elements | Those elements with atomic numbers 89 to 103, corresponding to the lanthanides in the Periodic Table. Synonym: actinide elements. Origin: actinium, first element of the series (05 Mar 2000) |
| actinides | Those elements with atomic numbers 89 to 103, corresponding to the lanthanides in the Periodic Table. Synonym: actinide elements. Origin: actinium, first element of the series (05 Mar 2000) |
| actiniform | Having a radiated form, like a sea anemone. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998) |
| actinin | <chemical> A protein factor that regulates the length of r-actin. It is chemically similar, but immunochemically distinguishable from actin. Chemical name: Actinins, alpha- (12 Dec 1998) |
| actinism | The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998) |
| actinium | <chemistry> 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. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998) |
| actino- | Combining form meaning a ray, as of light; applied to any form of radiation or to any structure with radiating parts. See: radio-. Origin: G. Aktis, aktinos, a ray of light, a beam. (05 Mar 2000) |
| actino-chemistry | Chemistry in its relations to actinism. Source: Websters Dictionary (01 Mar 1998) |
| actinobacillosis | A disease characterised by suppurative and granulomatous lesions in the respiratory tract, upper alimentary tract, skin, kidneys, joints, and other tissues. Actinobacillus lignieresii infects cattle and sheep while a. Equuli infects horses and pigs. (12 Dec 1998) |
| actinobacillus | A genus of pasteurellaceae described as gram-negative, nonsporeforming, nonmotile, facultative anaerobes. most members are found both as pathogens and commensal organisms in the respiratory, alimentary, and genital tracts of animals. (12 Dec 1998) |
| actinobacillus actinomycetemcomitans | A species of gram-negative, facultatively anaerobic spherical or rod-shaped bacteria that associates with species of actinomyces in actinomycotic lesions. (12 Dec 1998) |