noun
stone weight (for pickling)
Specifically a heavy stone placed on top of a pickle tub or similar container to press down the contents. Often abbreviated from 重し石.
See also: 重し石
祖母は漬物を作るとき、重しを乗せて一晩置く。
When my grandmother makes pickles, she puts a weight on them and leaves them overnight.
noun
A weight used in a balance or scale for measuring mass. Less common than 分銅 (ふんどう) in modern contexts.
古い天秤には、いくつかの重しが付属している。
An old balance comes with several weights.
Compound of 重 (omo, 'heavy') + し (nominalizing suffix). The kanji 重し is a standard representation; 重石 is a specific spelling for the stone weight sense.