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conception the fertilizing of an egg by a sperm; beginning of pregnancy. [1/2 definitions]
penis the male sex organ through which sperm is transferred to a female. The penis is also used to dispose of urine.
sperm whale a very large mammal that lives in the ocean. Sperm whales dive very deeply and can hold their breath for over an hour. They are related to porpoises, dolphins, and other whales with teeth. Sperm whales are the largest toothed whale.