abiotrophy

noun
abi·ot·ro·phy | \ ˌā-(ˌ)bī-ˈä-trə-fē \
plural abiotrophies

Medical Definition of abiotrophy 

: degeneration or loss of function or vitality in an organism or in cells or tissues not due to any apparent injury senile dementia and related abiotrophies —David Bowen

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occurring twice a year or every two years

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