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[From span.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Animals) a larva of a type of moth
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Sex pheromone chemistry and field trapping studies of the elm spanworm Ennomos subsignaria (Hubner) (Lepidoptera: Geometridae).
Elm spanworm, a pest of hardwood forests in the southern Appalachians.
Length of forewings recovered in feeding roosts ranged from 1.3 cm for the lesser maple spanworm moth (Itame pustularia) to 4.1 cm in the bride (Catocala neogama).