c.1600, with -ure
, from admix (1530s), a back-formation from admixt (early 15c.), from L. admixtus "mixed with," pp. of admiscere "to add to by mingling, mix with," from ad- "to" + miscere "to mix" (see mix
). M.E. admixt was mistaken as a pp. of a (then) non-existent M.E. *admix.