ˈspīnəs adjective
Etymology: spine + -ous
1. : difficult or unpleasant to handle or meet : bristling , sharp , thorny
a spinous humor
2.
a. : having spines, thorns, or prickles
a spinous plant
b. : having sharp processes (as of bone)
the spinous appendage of a fish
c. : having the shape of a spine or thorn