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“hexactines”
In sponge anatomy, one of the spicules forming six equal and similar rays meeting at right angles: Mr. Smart, the biology teacher, showed the students in his class a big photo of a skeleton of a sponge showing the triaxial form of its hexactines exemplified by its six arms grouped at right angles to one another.
A "spicule" is a small pointed structure serving as a skeletal element in various marine and freshwater invertebrates, such as sponges and corals.
This entry is located in the following units:
actino-, actin-, actini-, -actinal, actis- +
(page 6)
hex-, hexa-
(page 1)