The Collaborative International Dictionary of English v.0.48:

Tiptoe \Tip"toe`\, n.; pl. Tiptoes.
   The end, or tip, of the toe.
   [1913 Webster]

         He must . . . stand on his typtoon [tiptoes].
                                                  --Chaucer.
   [1913 Webster]

         Upon his tiptoes stalketh stately by.    --Spenser.
   [1913 Webster]

   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.
      [1913 Webster]
      [1913 Webster]

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.
      [1913 Webster]

            Night's candles are burnt out, and jocund day
            Stands tiptoe on the misty mountain tops. --Shak.
      [1913 Webster]

            Above the tiptoe pinnacle of glory.   --Byron.
      [1913 Webster]

   2. Noiseless; stealthy. "With tiptoe step." --Cowper.
      [1913 Webster]

   Tiptoe mirth, the highest degree of mirth. --Sir W. Scott.
      [1913 Webster]

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]