One of the mysteries of the English language finally explained.
1Chemistry= "allotropic". Now rare.
2Biology. Of an organism: feeding on other organisms; dependent to a large degree on organic compounds as a source of energy. rare.
3Ecology. Of a lake, stream, etc.: receiving its organic matter mainly or wholly from sources external to the body of water.
Mid 19th century. From allo- + -trophic. In sense 1 apparently an error for allotropic.
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