The Collaborative International Dictionary
Quadruplicating
Quadruplicate \Quad*ru"pli*cate\, v. t. [imp. & p. p. Quadruplicated; p. pr. & vb. n. Quadruplicating.] [L. quadruplicatus, p. p. of quadruplicare, fr. quadruple? fourfold. See Quadruplex.] To make fourfold; to double twice; to quadruple.
Wiktionary
quadruplicating
vb. (present participle of quadruplicate English)