noun

• (countable) The reproductive cell or gamete of the male; a spermatozoon.
  "In the Fall into the division of labor, Levi-Strauss sees the great hunters trading women to create the exogamous bonds of one hunting band with another. The egg is, but the sperm does. The tiny sperm may be furious in its activity, but its highway to the egg is paved by the alkaline trail set down by the Great Mother."
• (uncountable, slang) Semen; the generative substance of male animals.
  "Other Nations there are, that never have use of fire; Others, whose sperme is of a blacke colour."
• (chemistry) Sperm oil; whale oil from a sperm whale; spermaceti.
  "Holding his candle so that he could read the coffin plates, and so holding it that the sperm dropped in white patches which congealed as they touched the metal, he made assurance of Lucy’s coffin."

verb

• (intransitive, slang, vulgar) To ejaculate.
• (transitive, slang, vulgar) To ejaculate on or into.