DuckCorp Dico

Found one definition

1.                 From English-日本語 (にほんご) FreeDict+WikDict dictionary ver. 2022.11.18:
                   
   
   
                   
                     
   pileus //ˈpɪliəs// <n>
   1. 頭巾雲
   small cloud
   2. 傘
   the cap of a mushroom