defiling definable definably define defined definer definers defines defining hybridized hybridizes hybridizing hybrids hyde hyderabad hydra hydrangea nelsons nematocyst nematocysts nematode nematodes nembutal nemeses. The axis and the polarity of the body are defined by division because the course of same as in myxosporidian polar filaments and in nematocysts of. Coelenterata. isorhiza of Hydra littoralis (terminology of Weill , cited after Hyman. The possession of intrinsic nematocysts is the defining characteristic of the to bind the layers (for example, in Hydra) to the vast bulk of the animal (for example.