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A cuckold is the husband of an adulterous wife (or partner for unmarried companions); the wife of an adulterous husband is a cuckquean. In biology, a cuckold is a male who unwittingly invests parental effort in juveniles who are not genetically his offspring.[1] A husband who is aware of and tolerates his wife's infidelity is sometimes called a wittol or wittold.[2] The slang term bull refers to the dominant man who has relations with the cuckold's partner.