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Hellin's law

(hĕlĭnz)
n.
  1. The principle that twins occur once in 89 births, triplets once in 892 births, and quadruplets once in 893 births.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.