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heterocytotoxin
heterocytotoxin n. 
/ˌhɛdərəˌsaɪdəˈtɑks(ə)n/ a cytotoxin which destroys cells obtained from an animal of another species.
Brit. /ˌhɛt(ə)rə(ʊ)sʌɪtə(ʊ)ˈtɒksɪn/
, /ˌhɛt(ə)rə(ʊ)sʌɪtə(ʊ)ˈtɒksɪn/U.S. /ˌhɛdəroʊˌsaɪdəˈtɑks(ə)n/
, /ˌhɛdəroʊˌsaɪdəˈtɑks(ə)n//ˌhɛdərəˌsaɪdəˈtɑks(ə)n/ΚΠ
1902 Science 2 May 697/2 In that they are destructive for the specific cells through which they have been produced, they are termed ‘cytotoxins’. The most active are the heterocytotoxins, produced in alien animals.
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