Clark's weight rule

n.
  1. A rule for determining the approximate dose of medicine appropriate for a child two years of age or older by dividing the child's weight in pounds by 150 and multiplying the result by the adult dose.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.