One of the mysteries of the English language finally explained.
With plural (or occasionally singular) concord: a phylum of amoeboid protozoans comprising the ‘radiolarians’ and heliozoans, characterized by a spherical body with radiating axopodia. Also treated as plural: protozoans of this phylum (collectively or individually).
Late 19th century (in an earlier sense). From scientific Latin Actinopoda from ancient Greek ἀκτινο- + scientific Latin -poda.
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