1) Actinopod 
• (n.) One of the Radiolaria. • (a.) Of or pertaining to the Radiolaria.
any protozoan of the class Polycystinea (superclass Actinopoda), found in the upper layers of all oceans. Radiolarians, which are mostly spherically ... [6 related articles]
single-celled heterotrophic organisms with elaborate skeletons made of silica. These silica skeletons are so durable that radiolarian fossils are used to date deep-sea sediments.
Any protozoan of the class Polycystinea (superclass Actinopoda). Radiolaria are found as zooplankton in the upper layers of all oceans. They are mostly spherically symmetrical and known for their tiny, complex, perforated skeletons, known as tests, which are usually composed of silica.
A group of one-celled marine animals with a siliceous skeleton that occupies shallow portions of the
Ra`di·o·la'ri·an (rā`dĭ*o*lā'rĭ* a n) adjective (Zoology) Of or pertaining to the Radiolaria. -- noun One of the Radiolaria. 
A class of one-celled marine animals with siliceous skeletons that have existed in the ocean throughout the Phanerozoic Eon.
[n] - protozoa with amoeba-like bodies and radiating filamentous pseudopods
noun protozoa with amoeba-like bodies and radiating filamentous pseudopods