[1] : The Collaborative International Dictionary of English v.0.48

pure \pure\, a. compar. purer; superl. purest. oe. pur,
   f. pur, fr. l. purus; akin to putus pure, clear, putare to
   clean, trim, prune, set in order, settle, reckon, consider,
   think, skr. p? to clean, and perh. e. fire. cf. putative.
   1. separate from all heterogeneous or extraneous matter; free
      from mixture or combination; clean; mere; simple; unmixed;
      as, pure water; pure clay; pure air; pure compassion.
      1913 webster

            the pure fetters on his shins great.  --chaucer.
      1913 webster

            a guinea is pure gold if it has in it no alloy. --i.
                                                  watts.
      1913 webster

   2. free from moral defilement or quilt; hence, innocent;
      guileless; chaste; -- applied to persons. "keep thyself
      pure." --1 tim. v. 22.
      1913 webster

            now the end of the commandment is charity out of a
            pure heart, and of a good conscience. --1 tim. i. 5.
      1913 webster

   3. free from that which harms, vitiates, weakens, or
      pollutes; genuine; real; perfect; -- applied to things and
      actions. "pure religion and impartial laws." --tickell.
      "the pure, fine talk of rome." --ascham.
      1913 webster

            such was the origin of a friendship as warm and pure
            as any that ancient or modern history records.
                                                  --macaulay.
      1913 webster

   4. script. ritually clean; fitted for holy services.
      1913 webster

            thou shalt set them in two rows, six on a row, upon
            the pure table before the lord.       --lev. xxiv.
                                                  6.
      1913 webster

   5. phonetics of a single, simple sound or tone; -- said of
      some vowels and the unaspirated consonants.
      1913 webster

   pure-impure, completely or totally impure. "the inhabitants
      were pure-impure pagans." --fuller.

   pure blue. chem. see methylene blue, under methylene.
      

   pure chemistry. see under chemistry.

   pure mathematics, that portion of mathematics which treats
      of the principles of the science, or contradistinction to
      applied mathematics, which treats of the application of
      the principles to the investigation of other branches of
      knowledge, or to the practical wants of life. see
      mathematics. --davies  peck math. dict. 

   pure villenage feudal law, a tenure of lands by uncertain
      services at the will of the lord. --blackstone.
      1913 webster

   syn: unmixed; clear; simple; real; true; genuine;
        unadulterated; uncorrupted; unsullied; untarnished;
        unstained; stainless; clean; fair; unspotted; spotless;
        incorrupt; chaste; unpolluted; undefiled; immaculate;
        innocent; guiltless; guileless; holy.
        1913 webster
see also:
purer purest putative pure-impure pure blue methylene blue 
methylene pure chemistry chemistry pure mathematics mathematics 
pure villenage 

[2] : WordNet (r) 2.0

pure
     adj 1: free of extraneous elements of any kind; "pure air and
            water"; "pure gold"; "pure primary colors"; "the
            violin's pure and lovely song"; "pure tones" ant: impure
     2: without qualification; used informally as often pejorative
        intensifiers; "an arrant fool"; "a complete coward"; "a
        consummate fool"; "a double-dyed villain"; "gross
        negligence"; "a perfect idiot"; "pure folly"; "what a
        sodding mess"; "stark staring mad"; "a thoroughgoing
        villain"; "utter nonsense" syn: arranta, completea,
         consummatea, double-dyeda, everlastinga, grossa,
         perfecta, purea, soddinga, starka, staringa,
         thoroughgoinga, uttera
     3: concerned with theory and data rather than practice; opposed
        to applied; "pure science"
     4: of color being chromatically pure; not diluted with white
        or gray or black syn: saturated ant: unsaturated
     5: free from discordant qualities
     6: used of persons or behaviors; having no faults; sinless; "i
        felt pure and sweet as a new baby"- sylvia plath; "pure as
        the driven snow" ant: impure
     7: in a state of sexual virginity; "pure and vestal modesty";
        "a spinster or virgin lady"; "men have decreed that their
        women must be pure and virginal" syn: vestal, virgin,
         virginal, virtuous
     8: not mixed; "pure oxygen" syn: unmixed, undiluted
see also:
impure arranta completea consummatea double-dyeda everlastinga 
grossa perfecta purea soddinga starka 
staringa thoroughgoinga uttera saturated unsaturated 
vestal virgin virginal virtuous unmixed 
undiluted 

[3] : Moby Thesaurus II by Grady Ward, 1.0

365 moby thesaurus words for "pure":
   attic, christian, christlike, christly, ciceronian, god-fearing,
   spartan, above suspicion, absolute, abstract, academical,
   aesthetic, all-embracing, all-encompassing, all-out, all-pervading,
   angelic, antiseptic, artistic, ascetic, austere, authentic, bald,
   bare, basic, beyond all praise, blameless, blasted, bleached,
   blessed, blotless, bona fide, born, bright, broad-based, candid,
   card-carrying, chaste, choice, classic, classical, clean, cleanly,
   clear, common, commonplace, complete, comprehensive, conceptual,
   confounded, congenital, conjectural, consummate, correct,
   creditable, dainty, decent, decorous, deep-dyed, defectless,
   dinkum, direct, dirt-free, disinfected, downright, dry, dull,
   dyed-in-the-wool, easy, egregious, elegant, elementary, erect,
   essential, estimable, ethical, everyday, excellent, exemplary,
   exhaustive, fair, fastidious, faultless, finished, flawless,
   following the letter, frank, fresh, full of integrity, fundamental,
   garden, garden-variety, genuine, godlike, godly, godly-minded,
   good, graceful, gracile, gross, guileless, guiltless, heavenly,
   high-minded, high-principled, highly respectable, holy,
   holy-minded, homely, homespun, homogeneous, honest, honest-to-god,
   honorable, household, hypothetical, ideal, immaculate, impeccable,
   in good taste, inartificial, inculpable, indefectible, indefective,
   indivisible, infallible, infernal, innocent, intact, intensive,
   inviolate, irreducible, irreproachable, just, just right, kosher,
   law-abiding, law-loving, law-revering, lawful, lean, legitimate,
   lifelike, limpid, literal, lucid, maidenly, manly, matter-of-fact,
   mere, modest, monolithic, moral, natural, naturalistic, neat,
   noble, nondescript, nonpolluted, notional, of a piece, of choice,
   of cleanly habits, of quality, omnibus, omnipresent, open,
   ordinary, original, otherworldly, out-and-out, outright,
   pasteurized, peerless, pellucid, perfect, perspicuous, pervasive,
   philosophical, pious, plain, plain-speaking, plain-spoken,
   pleasing, plenary, plumb, polished, primal, primary, principled,
   proper, prosaic, prosing, prosy, pure and simple, pure in heart,
   purehearted, quiet, quintessential, radical, real, realistic,
   refined, regular, reputable, respectable, restrained, right,
   right-minded, righteous, rightful, ritually pure, round, rustic,
   saintlike, saintly, sanitary, seraphic, severe, sexually innocent,
   sheer, shiny, simon-pure, simple, simple-speaking, sincere, single,
   sinless, smut-free, smutless, snowy, sober, solid, spare,
   speculative, spiritual, spiritual-minded, spotless, stainless,
   stark, sterile, sterilized, sterling, straight, straightforward,
   subdued, sure-enough, sweeping, sweet, tahar, taintless, tasteful,
   terse, theoretical, thorough, thoroughgoing, through-and-through,
   total, trim, true, true to life, true to nature, true to reality,
   true-dealing, true-devoted, true-disposing, true-souled,
   true-spirited, truehearted, tubbed, ubiquitous, unadorned,
   unadulterated, unaffected, unalloyed, unassumed, unassuming,
   unbesmirched, unblamable, unblemished, unblotted, uncluttered,
   uncolored, unconcocted, unconditional, uncontaminated, uncopied,
   uncorrupt, uncorrupted, uncounterfeited, undefiled, understated,
   undifferenced, undifferentiated, undiluted, undisguised,
   undisguising, undistorted, unearthly, unexaggerated, unfabricated,
   unfanciful, unfaultable, unfeigned, unfeigning, unfictitious,
   unflattering, uniform, unimaginative, unimagined, unimitated,
   unimpeachable, uninvented, universal, unlabored, unmitigated,
   unmixed, unmuddied, unobtrusive, unpoetical, unpolluted,
   unpretended, unpretending, unqualified, unreserved, unrestricted,
   unromantic, unsimulated, unsmirched, unsmudged, unsoiled,
   unspecious, unspotted, unstained, unsullied, unsynthetic,
   untainted, untarnished, unvarnished, unworldly, upright,
   uprighteous, upstanding, utter, verbal, verbatim, veridical,
   verisimilar, veritable, vestal, virgin, virginal, virtuous,
   well-chosen, well-scrubbed, well-washed, white, whitened,
   wholesale, wholesome, word-for-word, workaday, workday, worthy,
   yeomanly

Pure >> P Words
Pure, definition of term: Pure
pure_pag1.html

Pure Mathematic >> P Words
Pure Mathematic, definition of term: Pure Mathematic
pure+mathematic_pag1.html

Make Pure >> M Words
Make Pure, definition of term: Make Pure
make+pure_pag1.html