Definitions
1.Adjectivedoubled
2.Adjectivevalvate with the margins curved outwardly
3.Adjectivefolded, with the abaxial surfaces facing one another
4.VerbTo double again: to multiply: to repeat.
5.VerbTo repeat (a word or part of a word) in order to form a new word or phrase, possibly with modification of one of the repetitions.