Strong's G5146 — τρίβολος (noun)
tribolos (trib'-ol-os) n.
1. (properly) a crow-foot (three-pronged obstruction in war)
2. (by analogy) a thorny plant (caltrop)
[from G5140 and G956]
KJV: brier, thistle 
Root(s): G5140, G956 
Hebrew root: βέλος
Occurrences: 2