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Webster 1913 Edition

Noun.

[

Iso-

+ Gr.

θέροσ

summer +

ὄμβροσ

rain.]

(Phys. Geog)

A line connecting or marking points on the earth’s surface, which have the same mean summer rainfall.

isotherombrose ‎(plural isotherombroses)

(geography) A line connecting or marking points on the Earth's surface that have the same mean summer rainfall.