http://www.macnn.com/articles/01/08/08/netdict.2.5:/
NetDICT 2.5: internet dictionary client
updated 08:10 am EDT, Wed August 8, 2001
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NetDICT 2.5 is a client for the RFC2229 Internet dictionary (DICT) protocol. It accesses a number of Internet dictionary databases, including Webster's Revised Unabridged, the U.S. Gazetter, several computing dictionaries and several Bible dictionaries. The Carbon release is both OS 9 and OS X compatible.
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apple's spelling dict?
i wonder if X's spelling dictionary could access this protocol...