Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The mature male gamete of an animal, usually consisting of a nucleate head, a short neck, and a thin motile tail.

from The Century Dictionary.

  • noun One of the numberless microscopic bodies contained in semen, to which the seminal fluid owes its vitality, and which are the immediate and active means of impregnating or fertilizing the ovum of the female; a spermatic cell or filament; a spermatozoan or spermatozooid.
  • noun A genus of animalcules.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Biol.) Same as spermatozoid.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun cytology The reproductive cell or gamete of the male, carried in semen, that fertilizes the ovum to produce the zygote.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun the male reproductive cell; the male gamete

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek σπέρμα (sperma, "sperm") + ζῷον (zōon, "living thing").

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