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â¢ SPINY (adjective) The adjective SPINY has 2 senses: 1. having spines. 2. having or covered with protective barbs or quills or spines or thorns or setae etc. Familiarity information: SPINY used as an adjective is rare.
The spinous process is one of two bony protrusions arising from the posterior side of each vertebra in the human spine. Extending backward and downwards from the main body of the vertebra, each is an extension of the lamina, two bony plates that converge at the back of each vertebra to form the vertebral arch.