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spicule
This term is primarily used in specialized scientific contexts, specifically within zoology, histology, and mineralogy. It describes a precise physical geometry—a sharp, needle-like projection—and carries a neutral, descriptive tone. In biological discussions, it refers to the structural elements of sponges, whereas in mineralogy, it describes similar crystalline growths.
Because it is a technical term, it is rarely encountered in general conversation. It is distinct from "spine" or "needle" in that it specifically denotes a microscopic or crystalline structure rather than a macroscopic appendage.
Meanings
Examples
The sponge skeleton is composed of thousands of tiny spicules.
Look at how these spicules interlock to create a rigid frame.
I wonder if these spicules are made of calcium or silica.
The specimen showed an unusual arrangement of spicules in the outer layer.
These spicules act like a natural armor against predators.
The mineral sample contains several needle-like spicules.
Wait, is that a single spicule or a cluster of crystals?
The microscopic spicules are barely visible without a high-power lens.