Strong's #6791: tsen (pronounced tsane)
 from an unused root meaning to be prickly; a thorn; hence, a cactus-hedge:--thorn.
Brown-Driver-Briggs Hebrew Lexicon:
 
  tsên 
 
 1) thorn, barb
 
 1a) meaning dubious
 
  Part of Speech: noun masculine
Relation: from an unused root meaning to be prickly
Usage:
This word is used 2 times:
Job 5:5: "eateth up, and taketh it even out of  the thorns, and the robber swalloweth up their substance."
Proverbs 22:5: " Thorns and snares are in the way of the froward: he that doth keep his soul shall be far from"