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The brown and green larva of a moth (Sibine stimulea) of the eastern United States, having a brown saddle-shaped mark on its back and stinging spines that are mildly poisonous.
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.