Pluteus

[plu:tiәs]

(noun.) a large genus of fungi belonging to the family Pluteaceae; the shape of the cap resembles a roof; often abundant early in the summer.

Typed by Elinor--From WordNet

(n.) The free-swimming larva of sea urchins and ophiurans, having several long stiff processes inclosing calcareous rods.

Editor: Tamara