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triactinal

adjective
tri·​actinal | \ (ˈ)trī¦aktənəl, ¦trīˌak¦tīnᵊl\
variants: or less commonly triactine \ (ˈ)trī¦akˌtīn , -​tə̇n \

Definition of triactinal

: having three rays a triactinal sponge spicule

History and Etymology for triactinal

tri- + -actinal or -actine

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