That grows at a rate proportional to a power of another population(adjective)
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Use "allometric" in a sentence
"Different breeds of dog achieve their different shapes by means of genes that change the allometric growth relationships between the parts of the body."
"In allometric growth, by contrast, different parts grow at different rates."
"Correlation does not give you the directionality of causation, so a few types of answers have been proposed — one is "junk" (large cells better tolerate the selective cost of useless DNA), one is "skeletal" (read Cavalier-Smith, it's complicated and involves a hypothesized allometric relationship), etc."