It’s the fish scale meaning. If I could post all of the OED stuff here I would. The sense of flaking from a husk or rind is from the 1450s - onion skin is referenced in this sense. Oxide films like rust date in the 1520s, and scale for tooth tartar is from the 1590s.
It’s the fish scale meaning. If I could post all of the OED stuff here I would. The sense of flaking from a husk or rind is from the 1450s - onion skin is referenced in this sense. Oxide films like rust date in the 1520s, and scale for tooth tartar is from the 1590s.