Definition of Actinoid

1. Noun. Any of a series of radioactive elements with atomic numbers 89 through 103.

Exact synonyms: Actinide, Actinon
Generic synonyms: Group, Grouping



2. Adjective. Having a radial form. "Starfish are actinoid--that is, they are radially symmetrical"

Definition of Actinoid

1. a. Having the form of rays; radiated, as an actinia.

Definition of Actinoid

1. Noun. (inorganic chemistry) actinide ¹

2. Adjective. Having the form of rays; radiated, as in the species of the family Actiniidae. ¹

¹ Source: wiktionary.com

Definition of Actinoid

1. an actinide [n -S] - See also: actinide

Medical Definition of Actinoid

1. Having the form of rays; radiated, as an actinia. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998)

Actinoid Pictures

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Lexicographical Neighbors of Actinoid

actinobacillus actinomycetemcomitans
actinobacillus infections
actinobacillus pleuropneumoniae
actinobacteria
actinobacteria group
actinobacterial
actinobacterium
actinobiology
actinochemistry
actinodermatitis
actinodin
actinodins
actinogram
actinograph
actinohematin
actinoid (current term)
actinoids
actinolite
actinolites
actinolitic
actinological
actinologist
actinologists
actinology
actinomere
actinomeres
actinometer
actinometers
actinometric
actinometrical

Literary usage of Actinoid

Below you will find example usage of this term as found in modern and/or classical literature:

1. Corals and Coral Islands by James Dwight Dana (1890)
"The prominent subdivisions of polyps here recognized are the following: I. actinoid POLYPS.—Belated to the Actinia, or Sea-anemone, in tentacles and ..."

2. The Scientific Memoirs of Thomas Henry Huxley by Thomas Henry Huxley, Michael Foster (1898)
"Mollusca, including the Ascidians and Polyzoa. 4. Vertebrata. i. Hydroid and actinoid polypes.—In these animals the integument consists either of a simple ..."

3. The Standard Natural History by John Sterling Kingsley, Elliott Coues (1884)
"Anatomically, the two groups are distinguished, in part, as follows : In the actinoid corals we find a large number of internal radial septa and numerous ..."

4. Manual of Geology: Treating of the Principles of the Science, with Special by James Dwight Dana (1865)
"actinoid POLYPS, illustrated in figs. 147, 148, and all ordinary corals. ... Among the actinoid Polyps there are the following groups,—exclusive of those ..."

5. The Natural History Review: A Quarterly Journal of Biological Science by Armagh Natural History and Philosophical Society, Belfast Natural History and Philosophical Society, Cork Scientific and Literary Society, Cuvierian Society of Cork, Dublin University Zoological and Botanical Association, Literary and Scientific Instit (1861)
"... in one of which, Cnidaires, arc placed all the actinoid ... associate this genus with the actinoid polypes, not far from Actinia itself. ..."

6. Structure and Classification of Zoophytes by James Dwight Dana (1846)
"Between the budding individuals in plants and the budding actinoid polyp, there seems to be a less perfect resemblance; for the budding polyps in these ..."

7. Toilers in the Sea by Mordecai Cubitt Cooke (1889)
"The most important of the actinoid 1 corals are those which form compound groups, wherein a number of polyps are connected together in a colony, ..."

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