assay (v.)
c.1300, "to try, endeavor, strive; test the quality of," from Anglo-French assaier, from assai (n.), from Old French essai "trial" (see essay).
assay (n.)
"trial, test of quality, test of character," mid-14c., from Anglo-French assai (see assay (v.)). Meaning "analysis" is from late 14c.