n. /buy'oh euh say", -as"ay/ ; v. /buy'oh euh say"/ , n. , v. , bioassayed, bioassaying .
n.
1. determination of the biological activity or potency of a substance, as a vitamin or hormone, by testing its effect on the growth of an organism.
v.t.
2. to subject to a bioassay.
[ 1910-15; BIO(LOGICAL) + ASSAY ]