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Meaning of submarginal

sub•mar•gin•al

Pronunciation: (sub-mär'ju-nl), [key]
— adj.
  1. near the margin.
  2. below the margin.
  3. not worth cultivating, as land; less than satisfactory; unproductive.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.