Is it ensure, insure, or assure?
c.1600, from Latin obliteratus, past participle of obliterare "cause to disappear, blot out, erase, efface," figuratively "cause to be forgotten," from ob "against" (see ob-) + littera (also litera) "letter, script" (see letter (n.)); abstracted from phrase literas scribere "write across letters, strike out letters." Related: Obliterated; obliterating.
obliterate o·blit·er·ate (ə-blĭt'ə-rāt', ō-blĭt'-)
v. o·blit·er·at·ed, o·blit·er·at·ing, o·blit·er·ates
To remove an organ or another body part completely, as by surgery, disease, or radiation.
To blot out, especially through filling of a natural space by fibrosis or inflammation.