The Collaborative International Dictionary of English v.0.48:

Tiptoe \Tip"toe`\, n.; pl. Tiptoes.
   The end, or tip, of the toe.
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         He must . . . stand on his typtoon [tiptoes].
                                                  --Chaucer.
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         Upon his tiptoes stalketh stately by.    --Spenser.
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   To be a tiptoe, To stand a tiptoe, To stand on tiptoe
      or To be on tiptoe, to be awake or alive to anything; to
      be roused; to be eager or alert; as, to be a tiptoe with
      expectation.
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The Collaborative International Dictionary of English v.0.48:

Tiptoe \Tip"toe`\, a.
   1. Being on tiptoe, or as on tiptoe; hence, raised as high as
      possible; lifted up; exalted; also, alert.
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            Night's candles are burnt out, and jocund day
            Stands tiptoe on the misty mountain tops. --Shak.
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            Above the tiptoe pinnacle of glory.   --Byron.
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   2. Noiseless; stealthy. "With tiptoe step." --Cowper.
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   Tiptoe mirth, the highest degree of mirth. --Sir W. Scott.
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The Collaborative International Dictionary of English v.0.48:

Tiptoe \Tip"toe`\, v. i.
   To step or walk on tiptoe.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tiptoe
    adv 1: on tiptoe or as if on tiptoe; "standing tiptoe"
    adj 1: walking on the tips of ones's toes so as to make no
           noise; "moving with tiptoe steps"
    n 1: the tip of a toe
    v 1: walk on one's toes [syn: tiptoe, tip, tippytoe]

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "tiptoe":
   above, abovestairs, airward, all fours, aloft, aloof, atiptoe,
   be careful, be cautious, couch, crawl, crawling, creep, creeping,
   go on tiptoe, grovel, gumshoe, gumshoeing, high, high up,
   in the air, in the clouds, inch, inch along, lay wait, lie in wait,
   lurk, make haste slowly, nightwalk, nightwalking, on all fours,
   on high, on stilts, on the peak, on tippytoe, on tiptoe, over,
   overhead, pad, padding, prowl, prowling, pussyfoot, pussyfooting,
   repent, reptant, reptatorial, reptile, scrabble, scramble, shadow,
   sidle, sidling, skulk, skyward, slink, slinking, snake, snaking,
   sneak, sneaking, stalk, steal, steal along, stealing, straight up,
   take it easy, think twice, tip, tippytoe, tiptoeing, to the zenith,
   toe, up, upstairs, upward, upwards, walk on eggshells, worm,
   worm along, worming