sperm donor

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sperm donor (plural sperm donors)

  1. A man who donates sperm, usually anonymously, to a sperm bank or fertility clinic.
  2. (US, slang, derogatory) A man who is the father of a woman's child(ren), but no longer has a relationship (or has a hostile relationship) with the woman, and is typically uninvolved with the children as well. (Compare with baby mama).