Explain the difference between sperm the mass noun or singulare tantum which refers to a substance not the count noun which refers to a spermatozoon and semen I want a clear definitive explanation with sources and references if possible because Wikipedia does not explain the difference accurately 2004 12 29T22 45Z 19 04 August 27 2005 UTC Since no one wants to or is able to explain I m gon na write a disambiguation page because the two homonymous words sperm singulare tantum and sperm count noun don t refer to the same concept and since many articles which direct here refer to the mass noun instead of the count noun 2004 12 29T22 45Z 19 14 August 27 2005 UTC