radiolarian(redirected from Radiolarians)
Also found in: Thesaurus.
Any of various marine protozoans of the order (or phylum) Radiolaria, having rigid siliceous skeletons and spicules.
[From New Latin Radiolāria, order name, from Late Latin radiolus, diminutive of Latin radius, ray, spoke (in reference to their spicules); see ray1.]
(Animals) any of various marine protozoans constituting the order Radiolaria, typically having a siliceous shell and stiff radiating cytoplasmic projections: phylum Actinopoda (actinopods)
[C19: from New Latin Radiolaria, from Late Latin radiolus little sunbeam, from Latin radius ray, radius]
ra•di•o•lar•i•an(ˌreɪ di oʊˈlɛər i ən)
any of various very small marine protozoans of the class Radiolaria (or superclass Actinopoda), having slender radiating pseudopods and usu. bearing an elaborate outer skeleton.
n (Zool) → Strahlentierchen nt, → Radiolarie f (spec)