Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of tetractinellid is as below...

Tetractinellid :: Tetractinellid (n.) Any species of sponge of the division Tetractinellida. Also used adjectively.

Tetractinellida :: Tetractinellida (n. pl.) A division of Spongiae in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinae.

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