tu·me·fa·cient (tōō'mə-fā'shənt, tyōō'-) adj. Producing or tending to produce swelling or tumefaction.
[Latin tumefaciēns, tumefacient-, present participle of tumefacere, to tumefy : tumēre, to swell; see teuə- in Indo-European roots + facere, to make; see dhē- in Indo-European roots.]