The Collaborative International Dictionary of English v.0.48:

Margent \Mar"gent\, n. [OE. See Margin.]
   A margin; border; brink; edge. [Obs.]
   [1913 Webster]

         The beached margent of the sea.          --Shak.
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The Collaborative International Dictionary of English v.0.48:

Margent \Mar"gent\, v. t.
   To enter or note down upon the margin of a page; to margin.
   [Obs.] --Mir. for Mag.
   [1913 Webster]