Definition of "geometrid" []

• Any of various moths of the family Geometridae, having caterpillars commonly known as measuring worms that move by looping the body in alternate contractions and expansions. (noun)
• Of or belonging to the Geometridae. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Among northern insects, population cycles are best known in geometrid moths, particularly the autumnal moth (Epirrita autumnata), which exhibits massive population outbreaks with approximately 10-year intervals that extend into the forest tundra [99]."
• "The projected increase in the frequency of winter warming is very likely to severely suppress population densities; distort the cyclic dynamics and degree of geographic synchrony in lemmings, voles, and geometrid moths; and in some cases even lead to population extinctions."
• "The natural cyclic fluctuation of geometrid moth numbers is driven by density-dependent factors that lag outbreaks in time, including buildup of natural enemies, disease, and reduced food quality, and by weather conditions at all life stages."