Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class IV. Words Relating to the Intellectual Faculties
Division (I) Formation of Ideas
Section II. Precursory Conditions and Operations

463. Experiment.

   NOUN:EXPERIMENT; essay (attempt) [See Essay]; analysis (investigation) [See Inquiry]; docimasy, trial, tentative method, tâtonnement [F.].
  VERIFICATION, probation, experimentum crucis [L.], proof, criterion, diagnostic, test, crucial test; assay, ordeal.
  REAGENT, crucible, check, touchstone, pyx or pix [Brit. mint], curcuma paper, turmeric paper.
  EMPRICISM, rule of thumb.
  FEELER; pilot -, messenger- balloon; pilot engine; scout; straw to show the wind.
  SPECULATION, random shot, leap in the dark.
  EXPERIMENTER, experimentist, experimentalist, assayer, analyst, analyzer; prospecter or prospector, Forty-Niner [U. S.], adventurer; speculator, gambler, stock gambler, plunger [slang].
   VERB:EXPERIMENT; essay (endeavor) [See Essay]; try, assay; make an experiment, make trial of; give a trial to; put upon -, subject to- trial; experiment upon; rehearse; put -, bring -, submit- to the -test, – proof; prove, verify, test, touch, practice upon, try one’s strength.
  GROPE; feel -, grope- -for, – one’s way; fumble, tâtonner [F.], aller à tâtons [F.]; put -, throw- out a feeler; send up a pilot balloon; see how the -land lies, – wind blows; consult the barometer; feel the pulse; fish for, bob for; cast -, beat- about for; angle, trawl, cast one’s net, beat the bushes.
  VENTURE; try one’s fortune (adventure) [See Essay]; explore (inquire) [See Inquiry].
   ADJECTIVE:EXPERIMENTAL, probative, probatory, probationary; analytic, docimastic or docimastical, speculative, tentative; empirical.
  TRIED, tested, proved.
  ON TRIAL, on examination, on or under probation, “on suspicion” [Elbert Hubbard], under suspicion; on one’s trial.