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.

What is an Isophone?

1 : a phonetic isogloss (see isogloss sense 1) 2 : a phonetic feature shared by some but not all of the speakers of a dialect, language, or group of related languages.

What is the meaning of Isoneph?

: a line on a map connecting points that have the same average percentage of cloudiness.