the GNU version of the Collaborative International Dictionary of English
n. A condition of not generating or breeding freely; infertility; a form of homogenesis in which the hybrids are sterile among themselves, but are fertile with members of either parent race.
The Century Dictionary and Cyclopedia
n. Difficulty in breeding; difficult generation; sterility; infecundity.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. infertility between hybrids
Word Usage
"Rather, they favor policies that will stop some suffering in the short run but which will cause dysgenesis."