The Collaborative International Dictionary of English v.0.48:

Dorse \Dorse\, n. [Cf. L. dorsum the back. See Dorsel,
   Dosel.]
   1. Same as dorsal, n. [Obs.]
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   2. The back of a book. [Obs.]
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            Books, all richly bound, with gilt dorses. --Wood.
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The Collaborative International Dictionary of English v.0.48:

Dorse \Dorse\, n. (Zool.)
   The Baltic or variable cod (Gadus callarias), by some
   believed to be the young of the common codfish.
   [1913 Webster]