Hypertext Webster Gateway: "simplex"
From WordNet (r) 1.7 (wn)
simplex
adj 1: (telecommunication) allowing communication in only one
direction at a time, or in telegraphy allowing only
one message over a line at a time; "simplex system"
2: having only one part or element; "a simplex word has no
affixes and is not part of a compound--like `boy' compared
with `boyish' or `house' compared with `houseboat'"
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.