triactinal
adjective
tri·actinal
(ˈ)trī¦aktənəl,
¦trīˌak¦tīnᵊl
variants
or less commonly triactine
(ˈ)trī¦akˌtīn,
-tə̇n
: having three rays
a triactinal sponge spicule
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Merriam-Webster unabridged
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