The Collaborative International Dictionary of English v.0.48:

Pomegranate \Pome"gran`ate\ (?; 277), n. [OE. pomgarnet, OF.
   pome de grenate, F. grenade, L. pomum a fruit + granatus
   grained, having many grains or seeds. See Pome, and
   Garnet, Grain.]
   1. (Bot.) The fruit of the tree Punica Granatum; also, the
      tree itself (see Balaustine), which is native in the
      Orient, but is successfully cultivated in many warm
      countries, and as a house plant in colder climates. The
      fruit is as large as an orange, and has a hard rind
      containing many rather large seeds, each one separately
      covered with crimson, acid pulp.
      [1913 Webster]

   2. A carved or embroidered ornament resembling a pomegranate.
      --Ex. xxviii. 33.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pomegranate
    n 1: shrub or small tree native to southwestern Asia having
         large red many-seeded fruit [syn: pomegranate,
         pomegranate tree, Punica granatum]
    2: large globular fruit having many seeds with juicy red pulp in
       a tough brownish-red rind

Easton's 1897 Bible Dictionary:

Pomegranate
   i.e., "grained apple" (pomum granatum), Heb. rimmon. Common in
   Egypt (Num. 20:5) and Palestine (13:23; Deut. 8:8). The Romans
   called it Punicum malum, i.e., Carthaginian apple, because they
   received it from Carthage. It belongs to the myrtle family of
   trees. The withering of the pomegranate tree is mentioned among
   the judgments of God (Joel 1:12). It is frequently mentioned in
   the Song of Solomon (Cant. 4:3, 13, etc.). The skirt of the high
   priest's blue robe and ephod was adorned with the representation
   of pomegranates, alternating with golden bells (Ex. 28:33,34),
   as also were the "chapiters upon the two pillars" (1 Kings 7:20)
   which "stood before the house."