Brown Driver Briggs

 1. reed, stalk, bone, balances
  1) stalk
  2) water-plant, reed
  3) calamus (aromatic reed)
  4) derived meanings
1d1. measuring-rod
1d2. reed (as unit of measure - 6 cubits)
1d3. beam (of scales - for scales themselves)
1d4. shaft (of lampstand)
1d5. branches (of lampstand)
1d6. shoulder-joint