chrys·a·lis 
/ˈkrɪsələs/ noun
plural chry·sal·i·ses also chrys·a·lid·es /krɪˈsæləˌdi:z/ /ˈkrɪsələs/ noun [count] biology 1 : a moth or butterfly at the stage of growth when it is turning into an adult and is enclosed in a hard case 2 : a hard case that protects a moth or butterfly while it is turning into an adult — compare 1cocoon 1
