Spicule

[spikju:l]

(noun.) small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals.

Checked by Estes--From WordNet

(n.) A minute, slender granule, or point.

(n.) Same as Spicula.

(n.) Any small calcareous or siliceous body found in the tissues of various invertebrate animals, especially in sponges and in most Alcyonaria.

Checked by Lemuel