Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun actinoid

1 sense of actinoid

Sense 1
actinoid, actinide, actinon -- (any of a series of radioactive elements with atomic numbers 89 through 103)
       => group, grouping -- (any number of entities (members) considered as a unit)

Antonyms of adj actinoid

1 sense of actinoid

Sense 1
actinoid -- (having a radial form; "starfish are actinoid--that is, they are radially symmetrical")

INDIRECT (VIA actinomorphic) -> zygomorphic, bilaterally symmetrical, zygomorphous -- (capable of division into symmetrical halves by only one longitudinal plane passing through the axis)

Similarity of adj actinoid

1 sense of actinoid

Sense 1
actinoid -- (having a radial form; "starfish are actinoid--that is, they are radially symmetrical")
       => actinomorphic (vs. zygomorphic), actinomorphous -- (capable of division into symmetrical halves by any longitudinal plane passing through the axis)