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radioelement
radiogenic
radiogram
radiograph
radioimmunoassay
radioiodine
radioisotope
radiolabel
radiolarian
radiolocation
radiology
radiolucent
radiolysis
radiometer
radiometric dating
radiomimetic
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radiolarian

ra·di·o·lar·i·an [ ràydee ō lérree ən ] (plural ra·di·o·lar·i·ans)


noun 
Definition:
 
microscopic ocean organism: a single-celled ocean organism with a round silica-containing shell that has the organs of movement radiating around it. Amoebas are radiolarians.

[Late 19th century. < modern Latin Radiolaria< radiolus "little staff, stick" < radius "staff, spoke, ray"]
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