The anniversary of someone's death; the date on which a person died.
From death (Old English deaþ) + day (Old English dæg). Compounds death and day to mark the specific date of dying. May be influenced by or homologous with 'birthday.'
In Harry Potter, ghosts celebrate 'Deathday Parties' on the anniversary of their death—but the real term 'deathday' is used seriously in many cultures and religions, from Christian All Souls' Day to Buddhist death anniversaries.
Complete word intelligence in one call. Free tier — 50 lookups/day.