Crucible :  (noun)

1: a vessel made of material that does not melt easily; used for high temperature chemical reactions [syn: melting pot]

Bunsen burner, Erlenmeyer flask, Kipp generator, acid test, affliction, agitator, alembic, anvil, aspirator, assay, beaker, beater, blank determination, blender, blowpipe, brouillon, burette, caldron, calvary, capillary tube, cement mixer, churn, condenser, criterion, cross, crucial test, deflagrating spoon, desiccator, determination, distiller, docimasy, eggbeater, emulsifier, engine, essay, etna, feeling out, first draft, kiteflying, lathe, machine, matrass, melting pot, mixer, mortar, motor, ordeal, pestle and mortar, pipette, precision balance, probation, proof, reagent bottle, receiver, retort, rough draft, rough sketch, sounding out, standard, still, test, test case, test tube, touchstone, transducer, transformer, trial, tribulation, try, verification, visitation,