sperm UK /spɜːm/US /spɜɹm/noun 3verb 2forms 3phrases 1 noun3 •a cell from a male body that joins with a cell from a female to make a new living thingSeeing the two little moving cells – the result of her egg and Luke's sperm – was incredible, and two very long weeks later the clinic confirmed I was pregnant. — 2012 •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. — 1603 •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. — 1897 verb2 •(slang, vulgar) To ejaculate. •(slang, vulgar) To ejaculate on or into. formsspermed · sperming · sperms Phrases with sperm sperm donorA man who donates sperm, usually anonymously, to a sperm bank or fertility clinic.