pleural / plural / plurel [ˈplʊrəl]
pleural – adj. – 1. related to the lining of the lungs of vertebrates; 2. Zoology of or relating to the pleuron or pleurite of an arthropod, or to the pleura of a mollusc
plural – adj. & n. – adj. – occurring in multiples, more than one; n. – the number of a multiple
plurel – n. - a group or aggregate resulting from a process of categorizing or statistical analysis