Either of two nonvenomous, semiaquatic snakes (Eunectes murinus or E. noteus) of tropical South America that kill their prey by suffocating it in their coils. E. murinus, the giant anaconda, can attain lengths from 5 to 9 meters (16.4 to 29.5 feet).
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.