def·la·grate 
(dĕflə-grāt′)
(dĕflə-grāt′)intr. & tr.v. def·la·grat·ed, def·la·grat·ing, def·la·grates
To burn or cause to burn with great heat and intense light.
[Latin dēflagrāre, dēflagrāt- : dē-, intensive pref.; see DE- + flagrāre, to blaze; see bhel-1 in the Appendix of Indo-European roots.]
def′la·gration n.