A radially symmetrical segment or section of an organism, especially in radially symmetric animals like starfish or sea anemones.
From actino- (Greek aktis 'ray') + -mere (Greek meros 'part'). The term describes the repeating ray-like body segments in radially symmetric creatures.
Starfish and sea anemones are literally made of multiple 'ray-parts'—if you imagine lines radiating from the center, each section between those lines is an actinomere, which is why they can regrow arms so well!
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