Sentence:  This algorithm extends the model of RNS by incorporating multiple hypershape (hypersphere, hyperrectangle, or <WSD>hyperellipse</WSD>) detector representation in the unit hypercube [0, 1]<var>n</var> (Balachandran et al., 2007). 
Meaning of the word marked with <WSD> tags:  A multi-dimensional manifold of a certain type, a generalization of the ellipse and ellipsoid.