Describing tissues, organisms, or cells from different species or with different origins, especially used in medicine and biology.
From Greek hetero- (different) + -logous (derived from), used in biology to distinguish material from unlike sources. The term became standard in medical literature by the 19th century.
When doctors give someone a blood transfusion from a different person, that's heterologous blood—it's literally foreign material, which is why they have to match blood types so carefully!
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