Etymology
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Words related to oblivion

ob- 

word-forming element meaning "toward; against; before; near; across; down," also used as an intensive, from Latin ob (prep.) "in the direction of, in front of, before; toward, to, at, upon, about; in the way of; with regard to, because of," from PIE root *epi, also *opi "near, against" (see epi-).

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slime (n.)
Old English slim "slime," from Proto-Germanic *slimaz (source also of Old Norse slim, Old Frisian slym, Dutch slijm "slime, phlegm," German Schleim "slime"), probably related to Old English lim "birdlime; sticky substance," from PIE root *(s)lei- "slimy, sticky, slippery" (source also of Sanskrit linati "sticks, stays, adheres to; slips into, disappears;" Russian slimak "snail;" Old Church Slavonic slina "spittle;" Old Irish sligim "to smear," leinam "I follow," literally "I stick to;" Welsh llyfn "smooth;" Greek leimax "snail," limne "marsh, pool, lake," alinein "to anoint, besmear;" Latin limus "slime, mud, mire," linere "to daub, besmear, rub out, erase"). As an insult to a person from mid-15c. Slime-mold is from 1880.
obliterate (v.)

"blot out, cause to disappear, remove all traces of, wipe out," c. 1600, from Latin obliteratus, past participle of obliterare "cause to disappear, blot out (a writing), erase, efface," figuratively "cause to be forgotten, blot out a remembrance," from ob "against" (see ob-) + littera (also litera) "letter, script" (see letter (n.)). The verb was abstracted from the phrase literas scribere "write across letters, strike out letters." Related: Obliterated; obliterating.

oblivious (adj.)

mid-15c., "forgetful, disposed to forget, heedless," from Latin obliviosus "forgetful, that easily forgets; producing forgetfulness," from oblivio "forgetfulness, a being forgotten"(see oblivion). Meaning "unaware, unconscious (of something)" is by 1862; it formerly was regarded as erroneous, but this is now the main meaning and the word has lost its original sense of "no longer aware or mindful." Properly it should be used with to, not of. Related: Obliviously; obliviousness.

oubliette (n.)

"secret dungeon reached only via trapdoor and with an opening only at the top for admission of air," 1780, originally in a French context, from French oubliette (14c.), from oublier "to forget, show negligence" (Old French oblier, oblider), from Vulgar Latin *oblitare, from Latin oblitus, past participle of oblivisci "to forget" (see oblivion). Used for persons condemned to perpetual imprisonment or to perish secretly.