WordNet sense 1 (the process whereby a protein molecule assumes its intricate three-dimensional shape):

protein folding

WordNet sense 2 (a geological process that causes a bend in a stratum of rock):

fold

WordNet sense 3 (capable of being folded up and stored):

foldaway, foldable

WordNet sense 4 (capable of collapsing or being collapsed):

collapsible, collapsable