actinoid Meaning, Definition & Usage
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noun any of a series of radioactive elements with atomic numbers 89 through 103
actinide; actinon.
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adjective satellite having a radial form
- starfish are actinoid--that is, they are radially symmetrical
WordNet
Ac"tin*oid adjective
Etymology
Gr. , , ray +Definitions
Having the form of rays; radiated, as an actinia.