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A dense tropical rainforest usually having a cloud cover, especially one in the Amazon Basin.
[Spanish, forest, from Latin silva.]
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.
1. (Physical Geography) dense equatorial forest, esp in the Amazon basin, characterized by tall broad-leaved evergreen trees, epiphytes, lianas, etc
2. (Physical Geography) a tract of such forest
[C19: from Spanish and Portuguese, from Latin silva forest]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014