Pronunciation: (ir"i-dOO'su-bul, -dyOO'-), [key]
1. not reducible; incapable of being reduced or of being diminished or simplified further: the irreducible minimum.
2. incapable of being brought into a different condition or form.
a. of or pertaining to a polynomial that cannot be factored.
b. of or pertaining to a group that cannot be written as the direct product of two of its subgroups.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.