What does "margarous" mean?

Margarous: Margaric; -- formerly designating a supposed acid. [Obs.] MARGARYIZE; MARGARY'S FLUID Mar"ga*ry*ize, v. t. [imp. & p. p. -ized; p. pr. & vb. n. -izing.] [(J. J. Lloyd) Margary, inventor of the process + -ize.] To impregnate (wood) with a preservative solution of copper sulphate (often called Mar"ga*ry's flu"id [-riz]).

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