Organisms or organisms that obtain nutrition from within their own body or from internal sources.
From Greek 'entos' (within) and 'trophe' (nutrition or food). This biological term describes creatures with specific feeding strategies based on internal resources.
Some organisms are 'entotrophi'—they're essentially living on their own stored energy reserves, like a bear hibernating on its internal fat deposits for months without eating.
Complete word intelligence in one call. Free tier — 50 lookups/day.