fold
types of folds: a. anticline, b. syncline, c. isocline, d. overturned, e. recumbent, f. overthrust
The American Heritage® Science Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
fold1
top: isocline fold
center: overfold
bottom: recumbent fold
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Paper being folded to make a card.
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