offscouring, n. refuse, scum, offscum, recrement, dross, trash, waste.

offset, n. set-off, counterbalance, equivalent.—­v. counterbalance, counterpoise.

offshoot, n. scion, branch.

offspring, n. children, issue, progeny, posterity, descendants.

often, adv. frequently, repeatedly, oftentimes, ofttimes.  Antonyms:  seldom, infrequently.

oil, v. lubricate.

oiliness, n. lubricity, unctuousness, unctuosity, oleosity, glibness.

oil-producing, a. oleiferous.

oilstone, n. hone.

oily, a. unctuous, oleaginous, emulsive, lubricous; glib, fluent, plausible.

ointment, n. unguent, embrocation, salve.

old, a. aged, elderly, senescent, decrepit, venerable, patriarchal, superannuated, senile; former, pre-existing, preceding, ancient, archaic, antique, antiquated, olden, time-honored, traditional, immemorial, primitive, primordial, primeval, pristine, fossil; dilapidated, decayed, effete; practiced, veteran, experienced; sensible, astute, shrewd, sagacious.

old age. senility, dotage, superannuation, decrepitude.  Associated words:  geratology, geratic, gerontic.

old-fashioned, a. antiquated, archaic, passe, antique, obsolete, fogram, frumpish.

old-fashioned word. archaism.

old iron, glass, etc. junk.

old maid. spinster.

old man. veteran, patriarch, Nestor, elder, oldster, Methuselah, dotard; gaffer, crone, geezer; centenarian, octogenarian, sexagenarian, nonagenarian.

old-time, a. late, former, quondam.

old woman. beldame, crone, gammer; witch, hag, harridan.

old-womanish, a. anile.

old-womanishness, n. anility.

omen, n. foretoken, sign, augury, portent, presage, prognostic, auspice.

ominous, a. portentous, monitory, premonitory, threatening.

omission, n. default, oversight, neglect, pretermission, omittance, non-performance.

omit, v. leave out, slap, pretermit, disregard, neglect, overlook, ignore, delete.

omittance, n. omission, forbearance, default, neglect, oversight.

omnipresence, n. ubiquity.

omnipresent, n. ubiquitous.

one, n. unit.  Associated Words:  unify, unity, unification, numerary.

one after the other. seriatim; tandem; alternately, consecutively.

one hundred years. century, centenary.  Associated Words:  centenarian, centennial.

one letter.  Associated Word:  uniliteral.

on end. erect, perpendicular, upright.

oneness, n. unity, singleness, individuality, unanimity.

onerous, a. laborious, difficult, arduous.

one-sided, a. unilateral; partial, unfair, inequitable, ex parte.

one year.  Associated Words:  annual, annually.

on horseback. mounted.

onion, n. (that does not bottom out) scallion, eschallot, shallot.  Associated Words:  alliaceous, cepaceous, leek, allium, garlic.