单词	free-living
释义	free-living adjective free-liv·​ing ˈfrē-ˈli-viŋ  1 : marked by more than usual freedom in the gratification of appetites 2 a : not fixed to the substrate but capable of motility a free-living protozoan b : being metabolically independent : neither parasitic nor symbiotic a free-living adult hairworm Word History First Known Use 1818, in the meaning defined at sense 1 Medical Definition free-living adjective free-liv·​ing ˈfrē-ˈliv-iŋ  1 : not fixed to the substrate but capable of motility a free-living protozoan 2 : being metabolically independent : neither parasitic nor symbiotic
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