der·o·trem·a·ta \ˌderə.ˈtreməd.ə, -rēm-\noun plural Usage: capitalized Etymology: New Latin, from der- + -tremata in some especially former classifications: a division of tailed amphibians typically retaining gill slits but not external gills when adult and comprising the Cryptobranchidae and Amphiumidae • der·o·trem·ate\| ̷ ̷ ̷ ̷| ̷ ̷mə̇t, -ˌmāt\order·o·trem·a·tous\-məd.əs\adjective • der·o·treme\ˈderə.ˌtrēm\noun-s