The Collaborative International Dictionary of English v.0.48:

Seed \Seed\ (s[=e]d), n.; pl. Seed or Seeds. [OE. seed, sed,
   AS. s[=ae]d, fr. s[=a]wan to sow; akin to D. zaad seed, G.
   saat, Icel. s[=a][eth], sae[eth]i, Goth. manas[=e][thorn]s
   seed of men, world. See Sow to scatter seed, and cf.
   Colza.]
   1. (Bot.)
      (a) A ripened ovule, consisting of an embryo with one or
          more integuments, or coverings; as, an apple seed; a
          currant seed. By germination it produces a new plant.
      (b) Any small seedlike fruit, though it may consist of a
          pericarp, or even a calyx, as well as the seed proper;
          as, parsnip seed; thistle seed.
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                And God said, Let the earth bring forth grass,
                the herb yielding seed, and the fruit tree
                yielding fruit after his kind, whose seed is in
                itself.                           --Gen. i. 11.
          [1913 Webster]

   Note: The seed proper has an outer and an inner coat, and
         within these the kernel or nucleus. The kernel is
         either the embryo alone, or the embryo inclosed in the
         albumen, which is the material for the nourishment of
         the developing embryo. The scar on a seed, left where
         the stem parted from it, is called the hilum, and the
         closed orifice of the ovule, the micropyle.
         [1913 Webster]

   2. (Physiol.) The generative fluid of the male; semen; sperm;
      -- not used in the plural.
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   3. That from which anything springs; first principle;
      original; source; as, the seeds of virtue or vice.
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   4. The principle of production.
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            Praise of great acts he scatters as a seed,
            Which may the like in coming ages breed. --Waller.
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   5. Progeny; offspring; children; descendants; as, the seed of
      Abraham; the seed of David.
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   Note: In this sense the word is applied to one person, or to
         any number collectively, and admits of the plural form,
         though rarely used in the plural.
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   6. Race; generation; birth.
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            Of mortal seed they were not held.    --Waller.
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   Seed bag (Artesian well), a packing to prevent percolation
      of water down the bore hole. It consists of a bag
      encircling the tubing and filled with flax seed, which
      swells when wet and fills the space between the tubing and
      the sides of the hole.

   Seed bud (Bot.), the germ or rudiment of the plant in the
      embryo state; the ovule.

   Seed coat (Bot.), the covering of a seed.

   Seed corn, or Seed grain (Bot.), corn or grain for seed.


   To eat the seed corn, To eat the corn which should be saved
      for seed, so as to forestall starvation; -- a desparate
      measure, since it only postpones disaster. Hence: any
      desparate action which creates a disastrous situation in
      the long-term, done in order to provide temporary relief.


   Seed down (Bot.), the soft hairs on certain seeds, as
      cotton seed.

   Seed drill. See 6th Drill, 2
      (a) .

   Seed eater (Zool.), any finch of the genera Sporophila,
      and Crithagra. They feed mainly on seeds.

   Seed gall (Zool.), any gall which resembles a seed, formed
      on the leaves of various plants, usually by some species
      of Phylloxera.

   Seed leaf (Bot.), a cotyledon.

   Seed lobe (Bot.), a cotyledon; a seed leaf.

   Seed oil, oil expressed from the seeds of plants.

   Seed oyster, a young oyster, especially when of a size
      suitable for transplantation to a new locality.

   Seed pearl, a small pearl of little value.

   Seed plat, or Seed plot, the ground on which seeds are
      sown, to produce plants for transplanting; a nursery.

   Seed stalk (Bot.), the stalk of an ovule or seed; a
      funicle.

   Seed tick (Zool.), one of several species of ticks
      resembling seeds in form and color.

   Seed vessel (Bot.), that part of a plant which contains the
      seeds; a pericarp.

   Seed weevil (Zool.), any one of numerous small weevils,
      especially those of the genus Apion, which live in the
      seeds of various plants.

   Seed wool, cotton wool not yet cleansed of its seeds.
      [Southern U.S.]
      [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

seed oyster
    n 1: a young oyster especially of a size for transplantation