The quality of having spines or thorns.
Spinosities are often found in nature, like on plants or animals, and can be sharp or prickly.
Examples:
The cactus has many spinosities to protect itself.
I felt the spinosities of the hedge when I touched it.
The spinosities of the porcupine can hurt you if you get too close.
The spinosities of the rose bush make it hard to pick the flowers.
The spinosities of the sea urchin are very sharp and can hurt you.
The spinosities of the fish's fins help it to swim fast.