Tetractinellida
Pronunciation : Te*trac`ti*nel"li*da
Part of Speech : n.
Etymology : [NL., from Gr. (Zo?l.)
Definition : Defn: A division of Spongi? in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellin?.
pl.
Source : Webster's Unabridged Dictionary, 1913