The Collaborative International Dictionary of English v.0.48:

Walking \Walk"ing\,
   a. & n. from Walk, v.
   [1913 Webster]

   Walking beam. See Beam, 10.

   Walking crane, a kind of traveling crane. See under
      Crane.

   Walking fern. (Bot.) See Walking leaf, below.

   Walking fish (Zool.), any one of numerous species of
      Asiatic fishes of the genus Ophiocephalus, some of
      which, as Ophiocephalus marulius, become over four feet
      long. They have a special cavity over the gills lined with
      a membrane adapted to retain moisture to aid in
      respiration, and are thus able to travel considerable
      distances over the land at night, whence the name. They
      construct a curious nest for their young. Called also
      langya.

   Walking gentleman (Theater), an actor who usually fills
      subordinate parts which require a gentlemanly appearance
      but few words. [Cant]

   Walking lady (Theater), an actress who usually fills such
      parts as require only a ladylike appearance on the stage.
      [Cant]

   Walking leaf.
   (a) (Bot.) A little American fern (Camptosorus
       rhizophyllus); -- so called because the fronds taper
       into slender prolongations which often root at the apex,
       thus producing new plants.
   (b) (Zool.) A leaf insect. See under Leaf.

   Walking papers, or Walking ticket, an order to leave;
      dismissal, as from office; as, to get one's walking
      papers, i. e. to be dismissed or fired. [Colloq.]
      --Bartlett.

   Walking stick.
   (a) A stick or staff carried in the hand for hand for support
       or amusement when walking; a cane.
   (b) (Zool.) A stick insect; -- called also walking straw.
       See Illust. of Stick insect, under Stick.

   Walking wheel (Mach.), a prime mover consisting of a wheel
      driven by the weight of men or animals walking either in
      it or on it; a treadwheel.
      [1913 Webster]

WordNet (r) 3.0 (2006):

walking fern
    n 1: ferns having lanceolate fronds that root at the tip [syn:
         walking fern, walking leaf, Asplenium rhizophyllum,
         Camptosorus rhizophyllus]