Feeding on several kinds of food; obtaining nutrients in more than one way; specifically (of a parasitic organism) infesting many host species; (of a bee) visiting the flowers of many species.
Of an ovariole: having trophocytes or nurse cells enclosed in the follicle with the oocytes.
Of a lake: rich in nutrients, or a particular category of nutrient.
Mid 17th century (in an earlier sense). From poly- + -trophic.