We don't have synonyms for isophene yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are isoprene, isophane and isophone.
(n) :
A line (on a map, etc.) joining places where a particular biological phenomenon is exhibited in the same way, such as where plants flower at the same time (an isanthesic) or where the same proportion of clines is found.
(n) :
A line (on a map, etc.) joining places where a particular biological phenomenon is exhibited in the same way, such as where plants flower at the same time (an isanthesic) or where the same proportion of clines is found.