1. a small, needle-like structure or projection
Usage: biology
2. a small, sharp-pointed crystal or particle
Usage: geology; chemistry
3. a jet of gas rising from the sun’s surface
Usage: astronomy

Examples

• The sponge’s skeleton is made up of tiny calcium carbonate spicules.
• Sea urchins are covered with protective spicules that deter predators.
• Ice spicules formed on the window during the cold night.
• The researcher examined glass spicules under the microscope.
• Solar spicules can reach heights of several thousand kilometers.
• The coral’s spicules give it structural support in ocean currents.