ACTINOID

 Dictionary entry overview: What does actinoid mean? 

• ACTINOID (noun)
  The noun ACTINOID has 1 sense:

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

  Familiarity information: ACTINOID used as a noun is very rare.

• ACTINOID (adjective)
  The adjective ACTINOID has 1 sense:

1. having a radial form

  Familiarity information: ACTINOID used as an adjective is very rare.

 Dictionary entry details 

• ACTINOID (noun)

Meaning:

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

Classified under:

Nouns denoting substances

Synonyms:

actinide; actinoid; actinon

Hypernyms ("actinoid" is a kind of...):

group; grouping (any number of entities (members) considered as a unit)

• ACTINOID (adjective)

Meaning:

Having a radial form

Context example:

starfish are actinoid--that is, they are radially symmetrical

Similar:

actinomorphic; actinomorphous (capable of division into symmetrical halves by any longitudinal plane passing through the axis)