a tentative theory about the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena; "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
a proposal intended to explain certain facts or observations
the act of folding; "he gave the napkins a double fold"
a pen for sheep
a folded part (as in skin or muscle)
a geological process that causes a bend in a stratum of rock
an angular or rounded shape made by folding; "a fold in the napkin"; "a crease in his trousers"; "a plication on her blouse"; "a flexure of the colon"; "a bend of his elbow"
incorporate a food ingredient into a mixture by repeatedly turning it over without stirring or beating; "Fold the egg whites into the batter"
become folded or folded up; "The bed folds in a jiffy"
bend or lay so that one part covers the other; "fold up the newspaper"; "turn up your collar"