Definitions for: Actinoid


[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"



Webster (1913) Definition: Ac"tin*oid, a. [Gr. ?, ?, ray + -oid.]
Having the form of rays; radiated, as an actinia.

Synonyms: actinide, actinomorphic, actinomorphous, actinon

See Also: group, grouping

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