Wordnet polsko-angielski 
                         (European perennial grass widely cultivated for pasture and hay and as a lawn grass) 
perennial ryegrass, English ryegrass, Lolium perenne 
synonim: życica trwała
 (European perennial grass widely cultivated for pasture and hay and as a lawn grass) 
perennial ryegrass, English ryegrass, Lolium perenne 
synonim: życica trwała