The Collaborative International Dictionary of English v.0.48:

Podophthalmia \Pod`oph*thal"mi*a\, n. pl. [NL. See
   Podophthalmic.] (Zool.)
   The stalk-eyed Crustacea, -- an order of Crustacea having the
   eyes supported on movable stalks. It includes the crabs,
   lobsters, and prawns. Called also Podophthalmata, and
   Decapoda.
   [1913 Webster] Podophthalmic

The Collaborative International Dictionary of English v.0.48:

Decacerata \De*cac`e*ra"ta\, n. pl. [NL., fr. Gr. de`ka ten +
   ke`ras a horn.] (Zool.)
   The division of Cephalopoda which includes the squids,
   cuttlefishes, and others having ten arms or tentacles; --
   called also Decapoda. [Written also Decacera.] See
   Dibranchiata. Decachord

The Collaborative International Dictionary of English v.0.48:

Decapoda \De*cap"o*da\ (d[-e]*k[a^]p"[-o]*d[.a]), prop. n. pl.
   [NL., fr. Gr. de`ka ten + poy`s, podo`s, foot.]
   1. (Zool.) The order of Crustacea which includes the shrimps,
      lobsters, crabs, etc.
      [1913 Webster]

   Note: They have a carapace, covering and uniting the somites
         of the head and thorax and inclosing a gill chamber on
         each side, and usually have five (rarely six) pairs of
         legs. They are divided into two principal groups:
         Brachyura and Macrura. Some writers recognize a third
         (Anomura) intermediate between the others.
         [1913 Webster]

   2. (Zool.) A division of the dibranchiate cephalopods
      including the cuttlefishes and squids. See Decacera.
      Decapodal

WordNet (r) 3.0 (2006):

Decapoda
    n 1: lobsters; crayfish; crabs; shrimps; prawns [syn:
         Decapoda, order Decapoda]
    2: squids and cuttlefishes [syn: Decapoda, order Decapoda]