Edit : There's a list ofcommand line clients for dict.org here already, came across if after I had written the script. What a pity :/

So,

$ su -c  'yum -y install dictd'
$ dict -f fedora
3 definitions found
dict.org        2628    gcide   The Collaborative International Dictionary of English v.0.48
  fedora fe*do"ra (f[i^]*d[^o]r"[.a]), n.
     A soft felt hat with a crown creased lengthwise.

     Syn: felt hat, homburg, Stetson, trilby.
          [WordNet 1.5]
dict.org        2628    wn      WordNet (r) 2.0
  fedora
       n : felt hat with a creased crown [syn: {felt hat}, {homburg}, {Stetson},
            {trilby}]
dict.org        2628    gazetteer       U.S. Gazetteer (1990)
  Fedora, SD
    Zip code(s): 57337

Developers are lazy. Recently, I had published a post on command line text utils. One of the utils was to use curlto access the dict.org database. I got bored of using the command again and again, so I chucked it into a shell script. It's highly rudimentary, and doesn't validate or check for errors etc. yet, but works.

#!/bin/bash

# Copyright 2010 Ankur Sinha
# Author: Ankur Sinha
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>
#
# File : dict_org : A simple shell script to get definitions from dict.org
#
# TODOS :   - add error handling for output
#                 - structure output

main()
{

    # check if curl is installed
    if [ ! -f /usr/bin/curl ] ; then
        echo -e "This script requires curl to function.nPlease use your
package manager and install curl.nOn a Fedora system, run:
$ su -c 'yum install curl'"
        exit 2
    fi

    # get definition
    definition=$( curl -s dict://dict.org/d:"$1")

    echo "$definition" | more

    exit 0
}

# check for correct usage
if [ $# -ne 1 ] ; then
    echo -e "Usage : $0  nThis shell script takes only one argument,
the word you want to look up at dict.org"
    exit 1
fi

main $1

I've also uploaded it here