scalage

noun

1. an assessed percentage deduction, as in weight or price, granted in dealings with goods that are likely to shrink, leak, or otherwise vary in the amount or weight originally stated.
2. the amount of lumber estimated to be contained in a log being scaled.

noun

1. US a percentage deducted from the price of goods liable to shrink or leak
2. forestry, US and Canadian the estimated amount of usable timber in a log