het·​er·​om·​er·​ous | \ ¦hetərämərəs\

Definition of heteromerous 

1 : unrelated in chemical composition used of homeomorphous substances
2 of a flower : having one or more whorls the number of whose members differs from that of the remaining whorls opposed to isomerous
3 : having a thallus with one or more layers of algal cells heteromerous lichens opposed to homoeomerous

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History and Etymology for heteromerous

heter- + Greek meros part + English -ous

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