a scientific instrument used for measuring mass (weight)
equilibrium
Cases of word usage
1) an absence of balance between two quantities or totals (imbalance)
2) a stick etc used to point to things on a map etc; an indicator on a dial or balance (pointer)
3) one of the thin pieces of hard material that cover the skin of many fish etc; the chalky deposit inside kettles, water-pipes etc; a simple balance or instrument for weighing by comparing something with a known mass; any machine used for weighing (scale)
4) (beauty resulting from) the exact shape, design, of opposite parts; the quality of harmony or balance (in size, design etc) between different things (symmetry)
5) to measure (by means of a scale, balance etc) how heavy something is; to compare the importance, value etc of (one thing and another) (weigh)