sclerosponge

Etymology

From sclero- + sponge.

sclerosponge means A sponge with a soft body that covers a hard, often massive skeleton made of calcium carbonate, either aragonite or calcite. Lexicurio rates it Rare gem — a strength score of 82 out of 100.

noun

A sponge with a soft body that covers a hard, often massive skeleton made of calcium carbonate, either aragonite or calcite.