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spiny
Spiny describes a surface covered in spines, which are typically stiff, sharp, and pointed structures. It is most frequently used in biological contexts to describe animals (like hedgehogs or sea urchins) and plants (like cacti) that have evolved these structures for protection.
While similar to "thorny" and "prickly," there is a subtle difference in usage. "Thorny" is almost exclusively used for plants (like roses), whereas "spiny" is broader and commonly applies to animals. "Prickly" often describes a sensation of slight pain or a surface that is irritating rather than dangerously sharp, and it can be used metaphorically to describe a person's irritable temperament—a usage that "spiny" does not share.
In a technical or scientific register, "spiny" is the standard term for describing the morphology of a species, such as in the term "spiny lobster."
Meanings
Examples
The cactus has spiny needles that protect it from animals.
The sea urchin is a spiny creature that lives on the ocean floor.
I wonder if this spiny leaf will irritate my skin.
The monster had a spiny back and glowing red eyes.
Be careful not to touch the spiny parts of the stem.
The biologist noted the spiny texture of the specimen.
That looks like a spiny lizard from the desert.