Kalmar “Exuvial” tana nufin wani abu da ke da alaƙa da ko kuma aka samo shi daga fatar da aka jefar, harsashi, ko wani abin rufewar dabba ko kwarin waje a lokacin girma ko yayyafawa. Hakanan za'a iya amfani da kalmar don bayyana ragowar irin wannan suturar da aka zubar, kamar exuviae ko exoskeletons.
