The Collaborative International Dictionary of English v.0.48:

Gamete \Gam"ete\ (g[a^]m"[=e]t; g[.a]*m[=e]t"; the latter
   usually in compounds), n. [Gr. gameth` wife, or game`ths
   husband, fr. gamei^n to marry.] (Biol.)
   A sexual cell or germ cell having a single set of unpaired
   chromosomes; a conjugating cell which unites with another of
   like or unlike character to form a new individual. In Bot.,
   gamete designates esp. the similar sex cells of the lower
   thallophytes which unite by conjugation, forming a zygospore.
   The gametes of higher plants are of two sorts, sperm (male)
   and egg (female); their union is called fertilization, and
   the resulting zygote an oospore. In Zool., gamete is most
   commonly used of the sexual cells of certain Protozoa, though
   also extended to the germ cells of higher forms.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Sperm \Sperm\, n.[F. sperme, L. sperma, Gr. ???, ???, from ????
   to sow. Cf. Spore.] (Physiol.)
   The male fecundating fluid; semen. See Semen.
   [1913 Webster]

   Sperm cell (Physiol.), one of the cells from which the
      spermatozoids are developed.

   Sperm morula. (Biol.) Same as Spermosphere.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sperm \Sperm\, n.[Contr. fr. spermaceti.]
   Spermaceti.
   [1913 Webster]

   Sperm oil, a fatty oil found as a liquid, with spermaceti,
      in the head cavities of the sperm whale.

   Sperm whale. (Zool.) See in the Vocabulary.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sperm
    n 1: the male reproductive cell; the male gamete; "a sperm is
         mostly a nucleus surrounded by little other cellular
         material" [syn: sperm, sperm cell, spermatozoon,
         spermatozoan]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "sperm":
   act of love, adultery, androcyte, antheridium, antherozoid,
   aphrodisia, ass, autacoid, balling, bile, carnal knowledge,
   chalone, climax, cohabitation, coition, coitus, coitus interruptus,
   commerce, congress, connection, copula, copulation, coupling,
   diddling, digestive secretion, endocrine, fornication, gall,
   gastric juice, hormone, intercourse, intestinal juice, intimacy,
   lovemaking, making it with, male gamete, marital relations,
   marriage act, mating, meat, milt, mucus, onanism, orgasm, ovum,
   pancreatic juice, pareunia, pollen, procreation, prostatic fluid,
   protein, relations, rheum, salivary secretion, screwing, scum,
   seed, semen, seminal fluid, sex, sex act, sexual climax,
   sexual commerce, sexual congress, sexual intercourse,
   sexual relations, sexual union, sleeping with, sperm cell,
   spermagonium, spermatic fluid, spermatid, spermatiophore,
   spermatium, spermatocyte, spermatogonium, spermatophore,
   spermatozoa, spermatozoid, spermatozoon, tears, thyroxin, venery