The American Heritage® Dictionary of the English Language, 4th Edition
n. The mature fertilizing gamete of a male organism, usually consisting of a round or cylindrical nucleated cell, a short neck, and a thin motile tail. Also called sperm cell, zoosperm.
n. The reproductive cell or gamete of the male, carried in semen, that fertilizes the ovum to produce the zygote.
the GNU version of the Collaborative International Dictionary of English
n. Same as spermatozoid.
The Century Dictionary and Cyclopedia
n. 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.
n. A genus of animalcules.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the male reproductive cell; the male gamete
Word Usage
"To explain such “different people choices”, Parfit adopts the genetic identity view of personal identity: the identity of a person is at least in part constituted by the DNA the person has as a result of which ovum was fertilized by this or that spermatozoon in the creation of this person."