drill 2 
(drĭl)
(drĭl)n.
1. A shallow trench or furrow in which seeds are planted.
2. A row of planted seeds.
3. A machine or implement for planting seeds in holes or furrows.
tr.v. drilled, drill·ing, drills
1. To sow (seeds) in rows.
2. To plant (a field) in drills.
[Perhaps from drill, rill, from Middle English drille, sip.]