TICKLE DICT: Tcl Dictionary by Tony Baldwin

Tickle Dict wiki page

An online dictionary look-up tool, written in Tcl.tk, T-Dict is cross-platform,
running on Linux, Mac or Windows, and is 100% GPL, Free, Open Source Software.
Tickle Dict has access to 48 different dictionaries and resources.
You could shell out bit bucks for some commercial dictionary applications, but why?
TickleDict is free! (not a free trial, but always free, and no ads, spyware, malware, etc.)
You can change the font size or background color, save definitions to a text file, or select and copy text from the definition area to be pasted elsewhere..

TickleDict
click to enlarge
/ More screenshots at SourceForge

sample output: impropriety

Get it here: DOWNLOAD TICKLE DICT

Tickle Dict requires Tcl/Tk 8.5, some download options are:
tcl 8.5 from www.tcl.tk
download tcl8.5 from sourceforge
ActiveTcl8.5  
powered by dict.org
tcl/tk