spicule

noun

1. 1.A sharp, needle-like piece.
2. 2.A tiny glass flake formed during the manufacture of glass vials
3. 3.Any of many needle-like crystalline structures that provide skeletal support in marine invertebrates like sponges.
4. 4.A needle-like mating structure found only in male nematodes.
5. 5.A jet of matter ejected from the photosphere of the sun.