preferendum

noun
pref·er·en·dum | \ ˌprefəˈrendəm \
plural preferenda\-də \

Definition of preferendum 

: the range of a gradient item (as light, temperature, or moisture) that seems to be positively attractive to a motile organism when a selection is available

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History and Etymology for preferendum

New Latin, from Latin, neuter of gerundive of praeferre to prefer

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