incendiar
/inθenˈdjaɾ/ · B2 · verb
to set fire to
🔥 in- (into) + cendiar, from Latin incendere 'to kindle'; cf. English incense, incendiary
Spanish incendiar comes from Latin incendere, 'to set on fire'. English incendiary and incense (burned to make smoke) share this root, so the 'cend' part signals burning. An incendio is a fire, and incendiar is to start one.