Experimentally
The Century Dictionary and Cyclopedia
By experiment; by experience or trial; by operation and observation of results.
the GNU version of the Collaborative International Dictionary of English
adverb.
By experiment; by experience or trial.
Wiktionary, Creative Commons Attribution/Share-Alike License
adverb.
in the manner of an
experiment
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adverb.
in an experimental fashion