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Longman Dictionary of Contemporary English
sperm bank
▪ But where had his Glover genes come from if his father was in a sperm bank?
▪ In person, however, they have matured about as much as a sperm in a deep frozen sperm bank.
sperm bank

n. 1 (context medicine English) A place where sperm from donors is stored for future use in artificial insemination. 2 (context vulgar English) The vagina.

sperm bank

n. a depository for storing sperm

Sperm bank

A sperm bank, semen bank or cryobank is a facility or enterprise that collects and stores human sperm from sperm donors for use by women who need donor-provided sperm to achieve pregnancy. Sperm donated by the sperm donor is known as donor sperm, and the process for introducing the sperm into the woman is called artificial insemination, which is a form of third-party reproduction.

From a medical perspective, a pregnancy achieved using donor sperm is no different from a pregnancy achieved using partner sperm, and it is also no different from a pregnancy achieved by sexual intercourse.