1. a small, needle-like structure or projection, especially in biology
Usage: technical; biology

Examples

• The sponge’s skeleton contained numerous calcium carbonate spicula.
• Under the microscope, the researcher observed tiny spicula protruding from the cell surface.
• Each spicula served as a structural support element in the organism’s framework.
• The marine biologist catalogued different types of spicula found in various sponge species.
• Siliceous spicula help provide rigidity to the sponge’s body structure.