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tetrasomic

(tĕt′rə-sōmĭk)
adj.
  1. Relating to a cell nucleus in which one chromosome occurs four times, while all others are present in the normal number.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.