verb

• (transitive)
  "[H]e [Pope Gregory I] deſigned to obliterate and extinguiſh the memorie of Heathen antiquitie and Authors."
• (transitive)
  "The rainclouds obliterated the sun as they swept across the sky."
• (transitive)
  "The Senate approuing all that vvas done, decreed that his name ſhould bee obliterated out of all monuments in Rome, and neuer any Antoninus (a name before very gratious) ſhould rule againe their Empire: ſo odious vvas the remembrance of this Image of Ignominy."
• (transitive)
  "In the developing embryo the foregut is surrounded by a group of vascular structures of bilateral distribution connected with the branchial arches. Portions of these arches are obliterated to form the normally described aorta and great vessels. The ultimate persistence of only one main vascular arch, the left, as the aorta, permits the trachea and oesophagus to lie freely to its right side."

adj

• (except poetic) Completely destroyed or erased; effaced, obliterated.
  "[G]o to the herald's office, […] and thou shalt find in that office as many records of attainted families, and escheated families, and impoverished and forgotten, and obliterate families, as of families newly erected and presently celebrated."
• (entomology, rare) Of markings on an insect: difficult to distinguish from the background; faint, indistinct.