| Pronunciation: | | 'aktu`noyd
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 WordNet Dictionary |
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| | Definition: | |
- [n] any of a series of radioactive elements with atomic numbers 89 through 103
- [adj] having a radial form; "starfish are actinoid--that is, they are radially symmetrical"
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ACTINOID is a 8 letter word that starts with A. |
| | Synonyms: | | actinide, actinomorphic, actinomorphous, actinon |
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| | See Also: | | group, grouping |
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| Webster's 1913 Dictionary |
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| | Definition: | | \Ac"tin*oid\, a. [Gr. ?, ?, ray + -oid.]
Having the form of rays; radiated, as an actinia.
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| Biology Dictionary |
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| | Definition: | | Any element in the periodic table which has an atomic number between 89 and 103. |
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