triradiate

adjective
tri·ra·di·ate | \(ˌ)trī-ˈrā-dē-ət, -dē-ˌāt\

Definition of triradiate 

: having three rays or radiating branches a triradiate sponge spicule

First Known Use of triradiate

1846, in the meaning defined above

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The first known use of triradiate was in 1846

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