experimental

adj

1. Pertaining to or founded on experiment.

   “Chemistry is an experimental science.”

2. Serving to be experimented upon; used in an experiment.

   “Brown-Séquard, noting that Addison's disease involved the failure of the adrenal (or suprarenal) glands near the kidneys, removed them in experimental animals, and thus proved they were necessary for life […].”

3. Serving as an experiment; serving to experiment.

   “his experimental band”

   “an experimental engine”

   “In its sixty-year history here, some 4,170 engines of the 4-6-0 type have been constructed. This is the vast sequel of that bold experimental step of the Highland Railway in 1894.”

   “Numerous experimental tests and other observations have been offered in favor of animal mind reading, and although many scientists are skeptical, others assert that humans are not the only species capable of representing what others do and don’t perceive and know.”

4. Experiential, empirical.

   “experimental knowledge”

noun

1. The subject of an experiment.