Weka n. : A New Zealand rail (Ocydromus australis) which has wings so short as to be incapable of flight.

Example:
Why are Weka interactions important in biology?

Taxonomy
Data Mining, Open Source, Source Machine Learning Software, Weka project, mailing list, Pentaho, machine learning algorithms, live forum, Data Mining Software, dataset, Software, Getting started, Developers, tasks, Java code, tools, pre-processing, regression.

Defination from the web:
Collection of machine learning algorithms for solving data mining problems implemented in Java and open sourced under the GPL. Features documentation and related projects.