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

skeleton \skel"eton\, a.
   consisting of, or resembling, a skeleton; consisting merely
   of the framework or outlines; having only certain leading
   features of anything; as, a skeleton sermon; a skeleton
   crystal.
   1913 webster

   skeleton bill, a bill or draft made out in blank as to the
      amount or payee, but signed by the acceptor. eng.

   skeleton key, a key with nearly the whole substance of the
      web filed away, to adapt it to avoid the wards of a lock;
      a master key; -- used for opening locks to which it has
      not been especially fitted.

   skeleton leaf, a leaf from which the pulpy part has been
      removed by chemical means, the fibrous part alone
      remaining.

   skeleton proof, a proof of a print or engraving, with the
      inscription outlined in hair strokes only, such proofs
      being taken before the engraving is finished.

   skeleton regiment, a regiment which has its complement of
      officers, but in which there are few enlisted men.

   skeleton shrimp zool., a small crustacean of the genus
      caprella. see illust. under laemodipoda.
      1913 webster
see also:
skeleton bill skeleton key skeleton leaf skeleton proof skeleton regiment skeleton shrimp 
caprella laemodipoda 

[2] : WordNet (r) 2.0

skeleton key
     n : a passkey with much of the bit filed away so that it can
         open different locks

Church Key >> C Words
Church Key, definition of term: Church Key
church+key_pag1.html

Axial Skeleton >> A Words
Axial Skeleton, definition of term: Axial Skeleton
axial+skeleton_pag1.html