experimental
Pronunciation: /ɪkˌspɛrɪˈmɛnt(ə)l, ɛk-/
adjective
- 1(of a new invention or product) based on untested ideas or techniques and not yet established or finalized: an experimental drug
- relating to scientific experiments: experimental results

Origin:
late 15th century (in the sense 'having personal experience', also 'experienced, observed'): from medieval Latin experimentalis, from Latin experimentum (see experiment)