We don't have synonyms for quadrifurcate yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are quadrisulcate and quadrifurcated.
"1903: H.G. Wells, Mankind in the Making - The small schools might specialize upon the type locally most desirable, the larger might group its triplicate (or quadruplicate) system of sustained and serious courses about a common Library..."
"1891: Rudyard Kipling, American Notes - ... Fortune, who delights in making the miner or the lumber-man a quadruplicate millionaire and in "busting" the railroad king."
"1903: H.G. Wells, Mankind in the Making - The small schools might specialize upon the type locally most desirable, the larger might group its triplicate (or quadruplicate) system of sustained and serious courses about a common Library..."
"1891: Rudyard Kipling, American Notes - ... Fortune, who delights in making the miner or the lumber-man a quadruplicate millionaire and in "busting" the railroad king."