A bath of dilute sulphuric or nitric acid, etc., to remove burnt sand, scale, rust, etc., from the surface of castings, or other articles of metal, or to brighten them or improve their colour.
In an optical landing system, the hand-held controller connected to the lens, or apparatus on which the lights are mounted.
A small or indefinite quantity or amount (of something); a little, a bit, a few. Usually in partitive construction, frequently without "of"; a single grain or kernel of wheat, barley, oats, sand or dust.
From Middle English pikel, pykyl, pekille, pigell, borrowed from Middle Dutch, Middle Low German pekel. Cognate with Scots pikkill, Saterland Frisian Piekele, Dutch pekel, Low German pekel, peckel, pickel, bickel, German Pökel.
Perhaps from Scottish pickle, apparently from pick + -le. Compare Scots pickil.
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