The Collaborative International Dictionary of English v.0.48:

Oyster \Oys"ter\ (ois"t[~e]r), n. [OF. oistre, F. hu[^i]tre, L.
   ostrea, ostreum, Gr. 'o`streon; prob. akin to 'ostre`on bone,
   the oyster being so named from its shell. Cf. Osseous,
   Ostracize.]
   1. (Zool.) Any marine bivalve mollusk of the genus Ostrea.
      They are usually found adhering to rocks or other fixed
      objects in shallow water along the seacoasts, or in
      brackish water in the mouth of rivers. The common European
      oyster (Ostrea edulis), and the American oyster (Ostrea
      Virginiana), are the most important species.
      [1913 Webster]

   2. A name popularly given to the delicate morsel contained in
      a small cavity of the bone on each side of the lower part
      of the back of a fowl.
      [1913 Webster]

   Fresh-water oyster (Zool.), any species of the genus
      Etheria, and allied genera, found in rivers of Africa
      and South America. They are irregular in form, and attach
      themselves to rocks like oysters, but they have a pearly
      interior, and are allied to the fresh-water mussels.

   Oyster bed, a breeding place for oysters; a place in a
      tidal river or other water on or near the seashore, where
      oysters are deposited to grow and fatten for market. See
      1st Scalp, n.

   Oyster catcher (Zool.), See oystercatcher in the
      vocabulary.

   Oyster crab (Zool.) a small crab (Pinnotheres ostreum)
      which lives as a commensal in the gill cavity of the
      oyster.

   Oyster dredge, a rake or small dragnet for bringing up
      oysters from the bottom of the sea.

   Oyster fish. (Zool.)
      (a) The tautog.
      (b) The toadfish.

   Oyster plant. (Bot.)
      (a) A plant of the genus Tragopogon (Tragopogon
          porrifolius), the root of which, when cooked,
          somewhat resembles the oyster in taste; salsify; --
          called also vegetable oyster.
      (b) A plant found on the seacoast of Northern Europe,
          America and Asia (Mertensia maritima), the fresh
          leaves of which have a strong flavor of oysters.

   Oyster plover. (Zool.) Same as oystercatcher.

   Oyster shell (Zool.), the shell of an oyster.

   Oyster wench, Oyster wife, Oyster women, a women who
      deals in oysters.

   Pearl oyster. (Zool.) See under Pearl.

   Thorny oyster (Zool.), any spiny marine shell of the genus
      Spondylus.
      [1913 Webster] oystercatcher

The Collaborative International Dictionary of English v.0.48:

Vegetable \Veg`e*ta*ble\, a. [F. v['e]g['e]table growing,
   capable of growing, formerly also, as a noun, a vegetable,
   from L. vegetabilis enlivening, from vegetare to enliven,
   invigorate, quicken, vegetus enlivened, vigorous, active,
   vegere to quicken, arouse, to be lively, akin to vigere to be
   lively, to thrive, vigil watchful, awake, and probably to E.
   wake, v. See Vigil, Wake, v.]
   [1913 Webster]
   1. Of or pertaining to plants; having the nature of, or
      produced by, plants; as, a vegetable nature; vegetable
      growths, juices, etc.
      [1913 Webster]

            Blooming ambrosial fruit
            Of vegetable gold.                    --Milton.
      [1913 Webster]

   2. Consisting of, or comprising, plants; as, the vegetable
      kingdom.
      [1913 Webster]

   Vegetable alkali (Chem.), an alkaloid.

   Vegetable brimstone. (Bot.) See Vegetable sulphur, below.


   Vegetable butter (Bot.), a name of several kinds of
      concrete vegetable oil; as that produced by the Indian
      butter tree, the African shea tree, and the Pentadesma
      butyracea, a tree of the order Guttiferae, also
      African. Still another kind is pressed from the seeds of
      cocoa (Theobroma).

   Vegetable flannel, a textile material, manufactured in
      Germany from pine-needle wool, a down or fiber obtained
      from the leaves of the Pinus sylvestris.

   Vegetable ivory. See Ivory nut, under Ivory.

   Vegetable jelly. See Pectin.

   Vegetable kingdom. (Nat. Hist.) See the last Phrase, below.


   Vegetable leather.
      (a) (Bot.) A shrubby West Indian spurge (Euphorbia
          punicea), with leathery foliage and crimson bracts.
      (b) See Vegetable leather, under Leather.

   Vegetable marrow (Bot.), an egg-shaped gourd, commonly
      eight to ten inches long. It is noted for the very tender
      quality of its flesh, and is a favorite culinary vegetable
      in England. It has been said to be of Persian origin, but
      is now thought to have been derived from a form of the
      American pumpkin.

   Vegetable oyster (Bot.), the oyster plant. See under
      Oyster.

   Vegetable parchment, papyrine.

   Vegetable sheep (Bot.), a white woolly plant (Raoulia
      eximia) of New Zealand, which grows in the form of large
      fleecy cushions on the mountains.

   Vegetable silk, a cottonlike, fibrous material obtained
      from the coating of the seeds of a Brazilian tree
      (Chorisia speciosa). It is used for various purposes, as
      for stuffing cushions, and the like, but is incapable of
      being spun on account of a want of cohesion among the
      fibers.

   Vegetable sponge. See 1st Loof.

   Vegetable sulphur, the fine and highly inflammable spores
      of the club moss (Lycopodium clavatum); witch meal.

   Vegetable tallow, a substance resembling tallow, obtained
      from various plants; as, Chinese vegetable tallow,
      obtained from the seeds of the tallow tree. Indian
      vegetable tallow is a name sometimes given to piney
      tallow.

   Vegetable wax, a waxy excretion on the leaves or fruits of
      certain plants, as the bayberry.
      [1913 Webster]
      [1913 Webster]

   Vegetable kingdom (Nat. Hist.), that primary division of
      living things which includes all plants. The classes of
      the vegetable kingdom have been grouped differently by
      various botanists. The following is one of the best of the
      many arrangements of the principal subdivisions.
      [1913 Webster] I. Phaenogamia (called also
      Phanerogamia). Plants having distinct flowers and true
      seeds. [ 1. Dicotyledons (called also Exogens). --
      Seeds with two or more cotyledons. Stems with the pith,
      woody fiber, and bark concentrically arranged. Divided
      into two subclasses: Angiosperms, having the woody fiber
      interspersed with dotted or annular ducts, and the seeds
      contained in a true ovary; Gymnosperms, having few or no
      ducts in the woody fiber, and the seeds naked. 2.
      Monocotyledons (called also Endogens). -- Seeds with
      single cotyledon. Stems with slender bundles of woody
      fiber not concentrically arranged, and with no true bark.]
      [1913 Webster] II. Cryptogamia. Plants without true
      flowers, and reproduced by minute spores of various kinds,
      or by simple cell division. [ 1. Acrogens. -- Plants
      usually with distinct stems and leaves, existing in two
      alternate conditions, one of which is nonsexual and
      sporophoric, the other sexual and oophoric. Divided into
      Vascular Acrogens, or Pteridophyta, having the
      sporophoric plant conspicuous and consisting partly of
      vascular tissue, as in Ferns, Lycopods, and Equiseta, and
      Cellular Acrogens, or Bryophyta, having the sexual
      plant most conspicuous, but destitute of vascular tissue,
      as in Mosses and Scale Mosses. 2. Thallogens. -- Plants
      without distinct stem and leaves, consisting of a simple
      or branched mass of cellular tissue, or reduced to a
      single cell. Reproduction effected variously. Divided into
      Algae, which contain chlorophyll or its equivalent, and
      which live upon air and water, and Fungi, which contain
      no chlorophyll, and live on organic matter. (Lichens are
      now believed to be fungi parasitic on included algae.]
      [1913 Webster]

   Note: Many botanists divide the Phaenogamia primarily into
         Gymnosperms and Angiosperms, and the latter into
         Dicotyledons and Monocotyledons. Others consider
         Pteridophyta and Bryophyta to be separate classes.
         Thallogens are variously divided by different writers,
         and the places for diatoms, slime molds, and stoneworts
         are altogether uncertain.
         [1913 Webster] For definitions, see these names in the
         Vocabulary.
         [1913 Webster]

WordNet (r) 3.0 (2006):

vegetable oyster
    n 1: Mediterranean biennial herb with long-stemmed heads of
         purple ray flowers and milky sap and long edible root;
         naturalized throughout United States [syn: salsify,
         oyster plant, vegetable oyster, Tragopogon
         porrifolius]
    2: long white salsify [syn: oyster plant, vegetable oyster]