Pronunciation: (ri-dOO'su-bul, -dyOO'-),[key] —adj. 1. capable of being reduced.
2. Math. a. of or pertaining to a polynomial that can be factored into the product of polynomials, each of lower degree.
b. of or pertaining to a group that can be written as the direct product of two of its subgroups.
c. of or pertaining to a set whose set of accumulation points is countable.