I‐soth′er‐om″brose (?), n. [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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.