Zoology. A star-shaped projection on the surface of a coralline; also, a star-shaped sponge-spicule.

Zoology. Any of the star-shaped forms or apertures found on the surface of fossilized corals, and of many extant stony corals (order Scleractinia)…

A stellate sponge-spicule.

A stellate sponge-spicule having very numerous rays soldered together for the greater part of their length.

A star-shaped sponge-spicule with slender cylindrical rays.