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(biology) Disproportionate growth of a part of a living organism in relation to the whole. quotations
Some organs may grow faster than the rest of the body so that their size increases not only in absolute terms, but also relatively to the rest of the body, which is positive allometry; or they may grow more slowly than the rest of the body, and so decrease in relative size, which is negative allometry.
1983 May 5, Paul Harvey, Tim Clutton-Brock, “The Survival of the Theory”, in New Scientist, volume 98, number 1356, London: New Science Publications, page 313
(biology) The science studying the differential growth rates of the parts of a living organism.