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def·la·grate /ˈdɛfləˌgreɪt/

verb (used with object), verb (used without object), –grat·ed, –grat·ing.
to burn, esp. suddenly and violently.

[Origin: 1720-30; < L déflagrātus (ptp. of déflagrāre to burn down), equiv. to – de- + flagr(āre) to burn + –ātus -ate1]

Related forms
def·la·gra·ble, adjective
def·la·gra·bil·i·ty, noun
def·la·gra·tion, noun

Source: Dictionary.com.

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