sperm or spermatozoon (spûr´mətəzō´ən, –zō´ŏn), in biology, the male gamete (sex cell), corresponding to the female ovum in organisms that reproduce sexually. In higher animals the sperm is produced in the testis of the male; it is much smaller than the ovum and consists primarily of a head, whose nucleus bears the hereditary material (see chromosome) of the male parent, and a slender whiplike process (flagellum), which provides the motility necessary for fertilization in a fluid medium. In higher plants the sperm is contained in the pollen grain and is conveyed to the ovum by the pollen tube; in some lower plants (e.g., mosses and ferns) the sperm is actively motile.
"sperm." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (April 20, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/sperm
"sperm." The Columbia Encyclopedia, 6th ed.. . Retrieved April 20, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/sperm