1.  defect(n = noun.state) - an imperfection in a bodily system; "visual defects"; "this device permits detection of defects in the lungs"
is a kind of imperfection, imperfectness
has particulars: myelatelia, birth defect, congenital abnormality, congenital anomaly, congenital defect, congenital disorder

2.  defect(n = noun.attribute) shortcoming - a failing or deficiency; "that interpretation is an unfortunate defect of our lack of information"
is a kind of disadvantage

3.  defect(n = noun.state) fault, flaw - an imperfection in an object or machine; "a flaw caused the crystal to shatter"; "if there are any defects you should send it back to the manufacturer"
is a kind of imperfection, imperfectness
has particulars: blister, bug, glitch, hole

4.  defect(n = noun.attribute) blemish, mar - a mark or flaw that spoils the appearance of something (especially on a person's body); "a facial blemish"
is a kind of appearance, visual aspect
has particulars: birthmark, nevus, chatter mark, check, chip, crack, dent, ding, gouge, nick, mole, mark, scar, scrape, scratch, burn, burn mark, blot, daub, slur, smear, smirch, smudge, spot, stigma, verruca, wart, milium, whitehead, blackhead, comedo

   defect(v = verb.social) desert - desert (a cause, a country or an army), often in order to join the opposing cause, country, or army; "If soldiers deserted Hitler's army, they were shot"
is one way to flee, fly, take flight
Derived forms noun defection₁, noun defection₂, noun defector₁
Sample sentences: Somebody ----s; Somebody ----s PP

defect, n. & v.
--n. also 1 lack of something essential or required; imperfection.
2 a shortcoming or failing.
3 a blemish.
4 the amount by which a thing falls short.
--v.intr. abandon one's country or cause in favour of another.

Derivative:
defector n.

Etymology:
L defectus f. deficere desert, fail (as DE-, facere do)

N  imperfection, imperfectness, deficiency, inadequacy, peccancy, immaturity, fault, defect, weak point, screw loose, flaw, gap, twist, taint, attainder, bar sinister, hole in one's coat, blemish, weakness, half blood, shortcoming, drawback, seamy side, mediocrity, no great shakes, no great catch, not much to boast of, one-horse shay, imperfect, not perfect, deficient, defective, faulty, unsound, tainted, out of order, out of tune, cracked, leaky, sprung, warped, lame, injured, peccant, frail, inadequate, crude, incomplete, found wanting, below par, short-handed, below its full strength, under its full strength, below its full complement, indifferent, middling, ordinary, mediocre, average, so-so, coucicouci, milk and water, tolerable, fair, passable, pretty well, pretty good, rather good, moderately good, good, good enough, well enough, adequate, decent, not bad, not amiss, inobjectionable, unobjectionable, admissible, bearable, only better than nothing, secondary, inferior, second-rate, second-best, one-horse, almost, to a limited extent, rather, pretty, moderately, passing, only, considering, all things considered, enough, surgit amari aliquid.

N  decrement, discount, defect, loss, deduction, afterglow, eduction, waste.

N  incompleteness, deficiency, short measure, shortcoming, insufficiency, imperfection, immaturity, half measures, defect, deficit, defalcation, omission, caret, shortage, interval, break, noncompletion, missing link, missing piece, missing part, gap, hole, lacuna, incomplete, imperfect, unfinished, uncompleted &c (complete), defective, deficient, wanting, lacking, failing, in default, in arrear, short of, hollow, meager, lame, halfand-half, perfunctory, sketchy, crude, mutilated, garbled, docked, lopped, truncated, in progress, in hand, going on, proceeding, incompletely, by halves, caetera desunt, caret.

N  blemish, disfigurement, deformity, adactylism, flaw, defect, injury, spots on the sun, eyesore, stain, blot, spot, spottiness, speck, speckle, blur, tarnish, smudge, dirt, freckle, mole, macula, patch, blotch, birthmark, blobber lip, blubber lip, blain, maculation, scar, wem, pustule, whelk, excrescence, pimple, pitted, freckled, discolored, imperfect, blobber-lipped, bloodshot, injured.

N  vice, evil-doing, evil courses, wrongdoing, wickedness, viciousness, iniquity, peccability, demerit, sin, Adam, old Adam, offending Adam, immorality, impropriety, indecorum, scandal, laxity, looseness of morals, enphagy, dophagy, exophagy, want of principle, want of ballast, obliquity, backsliding, infamy, demoralization, pravity, depravity, pollution, hardness of heart, brutality, corruption, knavery, profligacy, flagrancy, atrocity, cannibalism, lesbianism, Sadism, infirmity, weakness, weakness of the flesh, frailty, imperfection, error, weak side, foible, failing, failure, crying sin, besetting sin, defect, deficiency, cloven foot, lowest dregs of vice, sink of iniquity, Alsatian den, gusto picaresco, fault, crime, criminality, sinner, brothel, gambling house, joint, opium den, shooting gallery, crack house, vicious, sinful, sinning, wicked, iniquitous, immoral, unrighteous, wrong, criminal, naughty, incorrect, unduteous, undutiful, unprincipled, lawless, disorderly, contra bonos mores, indecorous, unseemly, improper, dissolute, profligate, scampish, unworthy, worthless, desertless, disgraceful, recreant, reprehensible, blameworthy, uncommendable, discreditable, disreputable, Sadistic, base, sinister, scurvy, foul, gross, vile, black, grave, facinorous, felonious, nefarious, shameful, scandalous, infamous, villainous, of a deep dye, heinous, flagrant, flagitious, atrocious, incarnate, accursed, Mephistophelian, satanic, diabolic, hellish, infernal, stygian, fiendlike, hell-born, demoniacal, devilish, fiendish, miscreated, misbegotten, demoralized, corrupt, depraved, evil-minded, evil-disposed, ill-conditioned, malevolent, heartless, graceless, shameless, virtueless, abandoned, lost to virtue, unconscionable, sunk in iniquity, lost in iniquity, steeped in iniquity, incorrigible, irreclaimable, obdurate, reprobate, past praying for, culpable, reprehensible, unjustifiable, indefensible, inexcusable, inexpiable, unpardonable, irremissible, weak, frail, lax, infirm, imperfect, indiscrete, demoralizing, degrading, wrong, sinfully, without excuse, Int, O tempora!, O mores!, alitur vitium vivitque tegendo, genus est mortis male vivere, mala mens malus animus, nemo repente fuit turpissimus, the trail of the serpent is over them all, to sanction vice and hunt decorum down.

atrial septal defect, autosomal recessive defect, birth defect, congenital defect, congenital heart defect, defect of speech, genetic defect, mass defect, septal defect, speech defect, ventricular septal defect, vision defect, visual defect