Strong's G2215 — ζιζάνιον (noun)
zizanion (dziz-an'-ee-on) n.
1. darnel, a poisonous ryegrass weed (a false grain)
2. (specially) darnel, a weed that greatly resembles wheat until ripe.  Close examination will often fail to discern the difference until its black grain appears.  It is most toxic just before harvest.  Its poison causes lethargy, deep sleep, and even death
3. (figuratively) wicked people sown by Satan amidst the Saints of God, that until harvest, have a resemblence of godliness (but you shall know them by their fruit)
[of uncertain origin]
KJV: tares 
Compare: G5578, G4108, G1114 
Occurrences: 8