The Collaborative International Dictionary of English v.0.48:

Pomaceous \Po*ma"ceous\, a. [LL. ponum an apple.]
   1. (Bot.)
      (a) Like an apple or pear; producing pomes.
      (b) Of or pertaining to a suborder (Pome[ae]) of rosaceous
          plants, which includes the true thorn trees, the
          quinces, service berries, medlars, and loquats, as
          well as the apples, pears, crabs, etc.
          [1913 Webster]

   2. Like pomace.
      [1913 Webster]