Source : Webster's Revised Unabridged Dictionary (1913)

Hexactinelline \Hex*ac`ti*nel"line\, a. [From NL.
   Hexactinellin[ae], fr. Gr. "e`x six + a dim. of ?, ?, a ray.]
   (Zo["o]l.)
   Belonging to the {Hexactinellin[ae]}, a group of sponges,
   having six-rayed siliceous spicules.