The Greek noun zizánion names a weed, commonly understood as darnel or false grain, that resembles wheat during early growth. It occurs only in Matthew 13's parable of the weeds and in Jesus' explanation of that parable. An enemy sows the weeds among good wheat. When both become visible, the servants want to remove the weeds, but the master refuses immediate uprooting because the wheat could be harmed.
He reserves separation for the harvest. In the private explanation, the Son of Man is the sower, the field is the world, the good seed represents the sons of the kingdom, the weeds represent the sons of the evil one, the enemy is the devil, the harvest is the end of the age, and the harvesters are angels. The noun therefore belongs to Jesus' own interpreted story of patient divine judgment.
It does not authorize a church, state, leader, or individual to label disliked people as weeds, investigate hearts, expel whole classes of neighbors, or enact final judgment. Faithful teaching centers the Son of Man, protects people from premature uprooting, takes evil seriously, and leaves final separation to the agents Jesus names.