sperm

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

• noun A male gamete, such as a spermatozoon of an animal or one of the cells or nuclei produced by a pollen grain of a plant.
• noun Semen.
• noun A substance, such as spermaceti, obtained from a sperm whale.

from The Century Dictionary.

• noun The male seed of any kind, as the semen or seminal fluid of the higher vertebrates, the male spawn or milt of the lower vertebrates, or the seminal elements of any animal, containing the male germs, or spermatozoa.
• noun Same as spermaceti.
• noun A sperm-whale.
• noun Sperm-oil.

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

• noun (Physiol.) The male fecundating fluid; semen. See semen.
• noun (Physiol.) one of the cells from which the spermatozoids are developed.
• noun (Biol.) Same as Spermosphere.
• noun Spermaceti.
• noun a fatty oil found as a liquid, with spermaceti, in the head cavities of the sperm whale.
• noun (Zoöl.) See in the Vocabulary.

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

• noun uncountable Semen; the generative substance of male animals.
• noun cytology The reproductive cell or gamete of the male; a spermatozoon.
• noun chemistry sperm oil; whale oil from a sperm whale; spermaceti.

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

• noun the male reproductive cell; the male gamete