scalage

[ skey-lij ]
/ ˈskeɪ lɪdʒ /

noun

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.
the amount of lumber estimated to be contained in a log being scaled.

Origin of scalage

An Americanism dating back to 1850–55; scale3 + -age

British Dictionary definitions for scalage

scalage
/ (ˈskeɪlɪdʒ) /

noun

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

Word Origin for scalage

C19: from scale ³ + -age