<synset id="n12618146" type="n">
<lex_filenum>20<lex_filenum/>
<word lex_id="0">horned pondweed<word/>
<word lex_id="0">Zannichellia palustris<word/>
<pointer refs="n12615710">Hypernym<pointer/>
<def>found in still or slow-moving fresh or brackish water<def/>
<def>useful to oxygenate cool water ponds and aquaria<def/>
<synset/>