The Collaborative International Dictionary of English v.0.48:

Doucet \Dou"cet\, Dowset \Dow"set\, n. [F. doucet sweet, dim. of
   doux. See Douce.]
   1. A custard. [Obs.]
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   2. A dowcet, or deep's testicle.
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The Collaborative International Dictionary of English v.0.48:

Dowcet \Dow"cet\, n. [See Doucet.]
   One of the testicles of a hart or stag. [Spelt also
   doucet.] --B. Jonson.
   [1913 Webster]