incense (n.) Look up incense at Dictionary.com
late 13c., from O.Fr. encens "sweet-smelling substance," from L.L. incensum (nom. incensus) "burnt incense," lit. "something burnt," neut. pp. of L. incendere "set on fire," from in- "in" + *candere "to set alight" (see incendiary).
incense (v.) Look up incense at Dictionary.com
"make angry," 1435, from M.Fr. incenser, from L. incensare, freq. of L. incendere "set on fire" (see incense (n.)). A figurative use of the word used literally in incense (n.).