The Collaborative International Dictionary of English v.0.48:

Lid \Lid\ (l[i^]d), n. [AS. hlid, fr. hl[imac]dan (in comp.) to
   cover, shut; akin to OS. hl[imac]dan (in comp.), D. lid lid,
   OHG. hlit, G. augenlid eyelid, Icel. hli[eth] gate, gateway.
   [root]40.]
   [1913 Webster]
   1. That which covers the opening of a vessel or box, etc.; a
      movable cover; as, the lid of a chest or trunk.
      [1913 Webster]

   2. The cover of the eye; an eyelid. --Shak.
      [1913 Webster]

            Tears, big tears, gushed from the rough soldier's
            lid.                                  --Byron.
      [1913 Webster]

   3. (Bot.)
      (a) The cover of the spore cases of mosses.
      (b) A calyx which separates from the flower, and falls off
          in a single piece, as in the Australian Eucalypti.
      (c) The top of an ovary which opens transversely, as in
          the fruit of the purslane and the tree which yields
          Brazil nuts.
          [1913 Webster]

WordNet (r) 3.0 (2006):

lid
    n 1: either of two folds of skin that can be moved to cover or
         open the eye; "his lids would stay open no longer" [syn:
         eyelid, lid, palpebra]
    2: a movable top or cover (hinged or separate) for closing the
       opening at the top of a box, chest, jar, pan, etc.; "he
       raised the piano lid"
    3: headdress that protects the head from bad weather; has shaped
       crown and usually a brim [syn: hat, chapeau, lid]