Source : Webster's Revised Unabridged Dictionary (1913)

Sea holm \Sea" holm`\
   A small uninhabited island.

Sea holm \Sea" holm`\ (Bot.)
   Sea holly.

Source : WordNet®

sea holm
     n : European evergreen eryngo with twisted spiny leaves
         naturalized on United States east coast; roots formerly
         used as an aphrodisiac [syn: {sea holly}, {sea eryngium},
          {Eryngium maritimum}]