isophene
noun
iso·phene
variants or less commonly isophane
-ˌfān
plural -s
1
: a line on a map or chart connecting places within a region at which a particular biological phenomenon (as the flowering of a given plant) occurs at one time
2
: phenocontour
Word History
Etymology
isophene from is- + -phene (from Greek phainein to show); isophane International Scientific Vocabulary is- + -phane (from Greek phainein to show)