Actinoid

[æktinɒid]

解释:

(noun.) 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' .

克林顿编辑--From WordNet

解释:

(a.) Having the form of rays; radiated, as an actinia.

海尔格校对